Black Box 5000 - Manuals

Table of Contents (continued) Table of Contents 5 5.5.7 Removing the CCM .........................................................................................................46 5.6 Installation Procedures ..............................................................................................

Multiserver 5000 6 External CSU/DSU to Internal CSU/DSU .............................................................................62 External CSU/DSU to External CSU/DSU.............................................................................62 CCM Indicators ....................................

Table of Contents (continued) Table of Contents 7 Introduction to X.21 .................................................................................................................77 Port Configuration for the X.21 Link ...............................................................................

Multiserver 5000 10 13. LCD/Keypad 13.1 General LCD/Keypad Information .............................................................................165 LCD Blinking Backlight ..........................................................................................................166 Keypad Reset......

Table of Contents 11 Display Messages Worksheet..................................................................................................188 Voice/Fax Parameters Worksheet .........................................................................................189 Record of Passwords ..........

Multiserver 5000 14 Async Channel Characteristics Capacity — up to 41 Speed — 50 to 38,400 bps Configuration — DCE ABR — to 19.2 Kbps Parity — Odd, Even, Mark, Space, None Stop Bits — 1, 1.5, 2 Characters — 5 to 8 bits/character plus parity (code levels 5 through 9) Burst Rate — 422 Kbps (half-duple...

CHAPTER 1: Specifications 15 Expansion Modules MS5 Expansion Module Sync/Async MX215C Connectors — (6) DB25 (female) Interface — RS-232, V.24/V.28 Transmission Mode — Serial async; full-duplex Configuration — DCE Speed — Async: 50 to 38,400 bps Sync: Protocol Dependent (see Sync Channel Characterist...

Multiserver 5000 16 MS1 Voice/Fax Cards MX225C-1 AND MX225C-2 General Specifications Channels per Voice/Fax Card — MX225C-1: One channelMX225C-2: Two channels Signals Supported — Analog voice and Group III fascimile (fax) Telephone Interfaces — PBX tie trunk: E&M Types I through V, 2-wire or 4-w...

CHAPTER 1: Specifications 17 Signaling Specifications Formats — Dial Pulse: ≤ 3% distortion @ 10 pulses per second Dual Tone Multifreq: ≤ 1% distortion Steady DC (E&M): Types I, II, III, IV, and V Single Frequency: 2280 Hz (AC15) on E&M 4 wire interface only Pulsed DC (RonTron): E&M inte...

CHAPTER 1: Specifications 19 MS1 NMS Module MX227C Command and Printer Ports: Connector — DB25 (female) Interface — RS-232/V.24/V.28 Transmission Mode — Serial async Data Rates — Up to 19.2 Kbps Alarm Relay Connector — 4-position terminal block MS1 V.35 Converter/DCE MX226 Converter — RS-232 to V.35...

2.1 The Multiserver 5000 (Base Unit) The Multiserver 5000 is a communications-networkmultiplexor. It integrates data, voice, fax, andexternal LAN bridge network traffic fortransmission over a single leased line, eliminatingthe need for individual telephone lines and Multiserver 5000 20 separate piec...

CHAPTER 2: Introduction 21 three (3) high-speed interconnect links (aMultiserver-to-Multiserver connection) in ports A1to A3, five (5) mux links (a Multiserver-to-feeder-mux connection) in ports A1 to A5, or five (5) datainput/output channels in ports A2 to A6. The high-speed interconnect or composi...

CHAPTER 2: Introduction 23 2.3 The CommPak The Multiserver 5000 Commpak plug-in softwarecartridge contains all of the Multiserver 5000’soperating software. To add features and programupgrades is simple—just change the cartridge. NOTE: The Multiserver 5000 CommPak cartridge is required for the unit t...

CHAPTER 2: Introduction 25 2.12 Manual Text Conventions This manual uses the following standardconventions: Partial menus are shown, and theywill be in the following format: Menu flows will show you what option you should select. The option is usually shown in a box: Text in bold represents the resp...

Multiserver 5000 26 3.1 Initial Considerations The Multiserver 5000 offers the ability to connectone of the following units and their associated links: • Multiserver (1000 or 5000) via an Interconnect Link. • Feeder Mux (Communication Box II or Statplex Multiplexor) via a Mux Link or an X.21 Link Th...

CHAPTER 3: Network Design and Topologies 27 3.4 Syntax for Node Numbers and IDs Multiserver units and compatible multiplexorsshare the same syntax for the node numbers andIDs. Node # Syntax: Use 1 through 254. (Number 1 isinput as 1, not 001.) Node ID Syntax: One to eight uppercase orlowercase chara...

Multiserver 5000 28 A3 A5 A4 A3 A5 A4 A1 A2 A1 A2 PORT Local Hub Group Remote Hub Group A1 A2 A1 A2 Figure 3-1. In this distributed star, A1 and A2 are interconnect links. A3, A4, and A5 are mux links. Figure 3-2. A1 and A2 are interconnect links. Figure 3-3. A1 and A2 are mux links. Multiserver 500...

Multiserver 5000 30 D UAL L INK P OINT - TO -P OINT Figure 3-5 illustrates a dual-link, point-to-point application. All traffic between Multiserver nodes is load-balanced between Link A and Link B. In the event of a single link failure, all traffic is automatically reroutedover the secondary link (l...

CHAPTER 3: Network Design and Topologies 31 S TRING If several Multiserver units are strung together, a string topology is created (Figure 3-6). The limitations tothis application are the following: • Maximum six hops • No closed loops Any or all of these may be Multiserver 5000 units. Three Multise...

Multiserver 5000 34 This chapter explains how to install the Multiserverbase unit. Once installation is completed, you willbe ready to configure. It is assumed that yourMultiserver has all optional modules alreadyinstalled. Module installation is discussed in chapter5. You should not hook up the int...

CHAPTER 4: Base-Unit Installation 35 4.2 CommPak Cartridge Installation and Removal I NSTALLING THE C OMM P AK C ARTRIDGE The CommPak cartridge contains the operatingsoftware for the Multiserver. When a cartridge is notbeing used, it should be stored in an anti-static bag. It is assumed that the CCM...

Multiserver 5000 36 On the front of the unit is a liquid-crystal display(LCD). After the unit completes its internal tests,the clock will start and the LCD will display amessage. The LCD backlight will also flash. This indicatesthat there is alarm message, probably Local Link reset A1 . This means t...

CHAPTER 4: Base-Unit Installation 37 4.6 Identify the Module Locations and Channel Numbers M ODULE L OCATION AND N OMENCLATURE There are five chassis positions available formodules in the Multiserver 5000. These areidentified from bottom to top as module locationsA through E. • The Communications Co...

Multiserver 5000 40 5.1 Module Stacking Order Although you are not actually installing themodules yet, it is important to become familiar withthe five chassis positions available for modules inthe Multiserver unit. These are identified frombottom to top as module locations A through E (see Figure 5-...

CHAPTER 5: Module Installation 41 5.2 Module-Location Switch Settings Each expansion module has a module-locationswitch group S1 that informs the software of itslocation in the Multiserver unit (see Figure 5-2 ). There are two exceptions: the CCM, which is alwaysin module location A, and the NMS mod...

CHAPTER 5: Module Installation 43 5.4 Blank Back Panel The unit is delivered with blank back panels toeliminate an open area in the rear of the unit wherethere are no modules installed ( Figure 5-4 ). Do not discard unused blank back panels; they may beneeded later. 5.5 Disassembly Procedures The di...

Multiserver 5000 44 5.5.1 U NPLUG THE M ULTISERVER Remove the power cord from the wall outlet. The Multiserver unit contains electrosensitivecomponents that could suffer damage from staticdischarge. Ground yourself by touching anygrounded equipment. Touching the Multiserver’schassis will not work. S...

CHAPTER 5: Module Installation 47 5. Disconnect the fan connector from the CCM. 6. Disconnect the 34-pin NMS module ribbon cable,if it is installed. 7. Unscrew the two screws in the back panel. 8. Gently remove the board by lifting it up. 5.6 Installation Procedures The Multiserver unit contains ele...

Multiserver 5000 48 5. Connect the 26-pin LCD ribbon cable to theCCM. 6. Connect the fan connector to the CCM. 7. Connect the 34-pin NMS Module ribbon cable, ifinstalled, to the CCM. 8. Place a spacer on top of the CCM by inserting itat the top of the bezel at the front of the unit andthen sliding i...

CHAPTER 5: Module Installation 49 5.6.4 R EMAINING S PACERS When finished installing the modules, reinstall anyremaining spacers. 5.6.5 I NSTALLING B LANK B ACK P ANELS The space above the last module installed must befilled with blank back panels for the followingreasons: • To provide a safe unit •...

Multiserver 5000 50 5.6.6 P UT THE C OVER B ACK O N 1. Be sure that all spacer positions have been filled before replacing the cover to ensure propermodule connections. 2. Be sure blank back panels have been installed into the back of the unit to eliminate openspaces. 3. Be careful not to handle the...

CHAPTER 5: Module Installation 51 5.7 Converters (Optional Equipment) The converter is attached externally to theMultiserver unit. The V.35 and X.21 Convertersconsist of an adapter (which connects directly tothe Mulitserver) and a cable. The cable is includedwith the V.35 converter. The cable is not...

Multiserver 5000 52 6.1 Multiserver Base Unit Location Your Multiserver should be installed at its location.If you have a Rackmount Kit, install it now (see Appendix G ). Place the Multiserver in the Rackmount Tray when completed. 6.2 Connecting an ASCII Terminal You will need to connect an ASCII te...

CHAPTER 6: Getting Started 53 6.3 The Command Facility The Command Facility contains menus to configurethe ports, node, and data channels. You will need toaccess the Command Facility often during theconfiguration process. When an ASCII terminal isconnected, the screen is blank except for the cursorp...

CHAPTER 6: Getting Started 55 6.4 Reset Defaults Use one of the following methods to ensure that theMultiserver’s configurations are set to standarddefault values. • Enter the Command Facility Main Menu to perform a cold start. • Perform a cold start using the front-panel keypad. Refer to Figure 6-2...

Multiserver 5000 56 6.5 Name the Local Node You will need to assign the local node a number andname to differentiate it from remote nodes. Referto the worksheets you used in connection with Chapter 3.0, Planning Your Network . Before proceeding, please review: Section 3.3 Nodes and Hubs Section 3.4 ...

CHAPTER 6: Getting Started 57 When you have entered a valid number and ID, thefollowing message will appear: Enter Y to store your changes and to reset the local node. If you select C , you will be returned to the NODE ID CONFIGURATION Menu and your configuration will be placed in temporary storage....

Multiserver 5000 58 6.6 Quick Setup C AN Y OU D O A Q UICK S ETUP ? A quick installation can be done to get a point-to-point Multiserver network up and running in ashort amount of time. You will be force-connectingall the channels within the network (A2 to A2, A3 toA3, etc.). Only channels of like t...

CHAPTER 6: Getting Started 59 T HE F ORCE -C ONNECTION The force-connection is accessed through theCommand Facility. Press <cr>. After all channels have been force-connected, youcan connect terminals to the ports and pass databetween them. Individual channels can be reconfigured as theneed ari...

Multiserver 5000 60 7.1 Overview This chapter discusses setting up your Multiservernetwork before it is installed in remote locations. Configuring and testing your network in onelocation before its final installation will alleviatemany problems that would result from not having aNetwork Manager at e...

CHAPTER 7: Bench Configuration and Testing 61 1 2 4 5 6 A B C D E 3 1 2 3 4 5 6 7 8 9 10 11 12 12 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 1 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 2 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 1 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 2 1 2 4 5 6 A B C D E 3 KTS ...

Multiserver 5000 62 7.2 Using CSU/DSUs with the Interconnect Link Figure 7-2 illustrates a Multiserver network, with a Multiserver 5000 as the central hub and three otherMultiservers attached to the local hub. Eachinterconnect link is set up differently. The CSU/DSU MS (MT132A-R2) is used in theseex...

CHAPTER 7: Bench Configuration and Testing 63 7.3 Using Modems with the Interconnect Link Figure 7-3 illustrates how modems can be used to connect two Multiservers. The modems you use withyour Multiservers must be V.32 or better, capable ofsynchronous, full-duplex, leased-line operation. Dialup mode...

Multiserver 5000 64 7.4 The Sync Data Channel Because of the myriad of different protocol andequipment combinations available for sync datachannels, there is no simple test that will ensureyour sync application will run smoothly. You willneed to complete data-channel configuration andthen test your ...

Multiserver 5000 66 The Multiserver will connect port A4 to port A5and you will get a CONNECTED message. Data can now be exchanged between the two datachannels. 4. Pass data between the terminals in both directions, and verify that the data has passedcorrectly. 5. To disconnect, press the <break&...

Multiserver 5000 68 7.6 Testing the RLB Module During Bench Configuration, you can quickly testyour MS RLB Modules to verify that they areworking properly. T HIN N ET By default, the BNC connector on the RLB Moduleis active. ThinNet Ethernet can connect directly tothe back of the RLB Module. No exte...

CHAPTER 7: Bench Configuration and Testing 69 7.7 Voice/Fax Channels Voice/fax channels are by default strapped forKTS—the setting for standard telephones. Testingvoice channels is a matter of force-connecting twochannels and plugging in standard telephones. F ORCE -C ONNECTED V OICE C HANNELS After...

Multiserver 5000 70 8.1 Types of Links There are three types of links in the Multiserversystem: An Interconnect Link connects two Multiservers (usually over an analog or digital circuitprovided by the telephone company). A Mux Link connects a Multiserver to a compatible multiplexer. The Feeder Mux c...

CHAPTER 8: Link Configuration 71 8.4 Port Configuration Before the link is installed, the port assigned to thelink must be configured. Configure the port afterthe local node is named (see Section 6.6, Name the Local Node ). The Port Configuration Menu is accessed from the Configure Local Nodes Menu....

Multiserver 5000 72 8.5 The Interconnect Link P ORT C ONFIGURATION FOR THE I NTERCONNECT L INK The Interconnect Link is for connection to anotherMultiserver. From the Port Configuration Menu,select option 3. For most applications, select Sync External Clocks.This is used when connecting to anotherMu...

CHAPTER 8: Link Configuration 73 When the local Multiserver 5000 connects toanother Multiserver, it scans the remote Multiserver,reads the node ID and numbers of the remoteMultiserver and feeder muxes, and stores theinformation in memory. C ONNECTING M ULTISERVER U NITS B ACK TO B ACK Follow these s...

Multiserver 5000 74 Next, select option 3 from the remote CommandFacility menu. It may seem to be a paradox to use the term “localnode” when configuring the remote Multiserver. Remember that when the remote Multiserver’sCommand Facility is accessed, in essence you are atthe remote site working as a ...

CHAPTER 8: Link Configuration 75 8.6 The Mux Link P ORT C ONFIGURATION FOR THE M UX L INK The mux link is for connecting the Multiserver to afeeder mux. The mux link can either be a leasedline or a crossover cable to a locally-placed feedermux. From the Port Configuration Menu, selectoption 4. The n...

Multiserver 5000 76 F EEDER M UX N ODE ID S You should renumber and rename a feeder muxafter configuring its link. Mux and X.21 links havedefault numbers and names according to the portthey are assigned (see Section 3.5 ). If there is a problem ascertaining the mux node ID,you may display the node s...

CHAPTER 8: Link Configuration 77 8.7 The X.21 Link I NTRODUCTION TO X.21 Unlike the mux links (leased-line links), which arepermanently connected, X.21 is a pay-as-you-go link.When a signal is raised, the network automaticallyestablishes the link to the remote side. When youare finished, the link is...

CHAPTER 8: Link Configuration 79 Table 8-2. X.21 Link Parameters (continued) Option Default Description 2. Local X.21 Number 20 This option selects the number of times the Multiserver will attempt to of Retries place a call over the X.21 network. The range is from 1 to 63 tries; thedefault is 20. Wh...

CHAPTER 8: Link Configuration 81 8.8 Review Link Configuration To review node configuration, select option 2,Status/Statistics, from the Command Facility MainMenu. The node ID and number appear at the top of thescreen. Each port configured as a link will be listed. Thenode ID and number of any attac...

Multiserver 5000 82 To configure data channels, the local node must benamed. If you have not already named the localnode, refer to Section 6.6, Naming the Local Node . Data channels on remote Multiservers can beconfigured once the remote Command Facility isaccessed. Local or remote feeder mux channe...

CHAPTER 9: Data-Channel Configuration 83 9.2 Synchronous Channels Sync is supported only when directly attached to aMultiserver. Feeder muxes can only support asyncor voice channels. Sync channels are not switchable and must be forceconnected. Refer to Section 10.4, Synchronous Connections . Unless ...

CHAPTER 9: Data-Channel Configuration 85 performed after changing the port configuration tosync. Leave the menu and perform the reset, and trythis procedure again. The CHANNEL CHARACTERISTICS menu will appear. This menu differs depending on the syncprotocol selected during port configuration. Table ...

CHAPTER 9: Data-Channel Configuration 87 Table 9-3. Sync Channel Characteristics (continued) Option Protocol Default Description Interface DLC TO DTE Set TO DTE for interfacing with data terminal Type ASCII Bisync TO DTE equipment. The channel will return CTS on in EBCDIC Bisync TO DTE response to R...

CHAPTER 9: Data-Channel Configuration 89 MICOM Voice ENABLE Table 9-3. Sync Channel Characteristics (continued) Option Protocol Default Description DSR Control DLC NORMAL When set to NORMAL, remote DTR changes to ASCII Bisync NORMAL appear on the local DSR. When set to FORCED EBCDIC Bisync NORMAL ON...

CHAPTER 9: Data-Channel Configuration 91 Table 9-6. CCM and 6-Channel CEM (MX215C only) Local Sync Channel Interface Configured to DTE Multiserver DTE Constant Controlled Pin I/O Carrier Mode Carrier Mode Pin I/O Signal 4 I Off-to-On transition On-to-Off transition 4 O RTS raises CTS. forces CTS off...

Multiserver 5000 92 Table 9-7. CCM and 6-Channel CEM (MX215C only) Local Sync Channel Interface Configured to DCE Multiserver DCE Constant Controlled Pin I/O Carrier Mode Carrier Mode Pin I/O Signal 8 O Held ON. Lead output data. 4 I RTS 11 I . . . Must be ON to enable data 5 O CTS output. 4 I . . ....

CHAPTER 9: Data-Channel Configuration 93 9.3 Asynchronous Channels Before configuring an async channel, be sure thatthe port is configured for async (from the PortConfiguration Menu). Ports (channels) A2 to A6and all CEM module ports are by default asyncchannels. You do not need to configure ports w...

Multiserver 5000 94 A SYNC C HANNEL C HARACTERISTICS The Channel Characteristics Menu is accessed fromthe Async Channels Menu as option 1. The operating parameters associated with all asyncterminals are set here The current configurationfor each characteristic is shown in brackets, to theright of th...

CHAPTER 9: Data-Channel Configuration 95 Table 9-8. Asynchronous Channel Characteristics Option Default Description 1. Data Rate 9600 Sets the data rate (in bps) for the port. It is recommended that portsattached to a host port be set for a fixed speed. (ABR=autobaud ratedetection. See explanation o...

Multiserver 5000 96 Table 9-8. Asynchronous Channel Characteristics (continued) Option Default Description 7. XON Character DC1 Selects the character for the X-ON function. To ascertain which controlcharacter to select, refer to the user manual of the device attached to theport. Choices for the X-ON...

CHAPTER 9: Data-Channel Configuration 97 Autobaud Rate Detection (ABR). The Multiserver 5000 has the capability of automaticallydetermining the data rate of a port in the range of50 to 19,200 bps by dynamically examining the first(sign-on) character after a connect. In addition, theMultiserver will ...

Multiserver 5000 98 C HANNEL F EATURES The Channel Features Menu is accessed from theAsync Channel Menu as option 2. Additional interface parameters associated withspecial applications are controlled by this menu.The current configuration for each menu option isdisplayed in brackets. Each of these f...

CHAPTER 9: Data-Channel Configuration 99 Table 9-11. Asynchronous Channel Features Option Default Description 1. Priority High Determines whether port is high or low priority in reference to other asyncports. (Async channels always have lower priority than voice/fax or syncchannels.) Keep the port’s...

Multiserver 5000 100 disconnect the channel in the event of loss of sync on the link. Table 9-11. Asynchronous Channel Features (continued) Option Default Description 8. Command Mode ^X Break There are two keying sequences available to the channel user for Entry Sequence accessing the Command Mode. ...

CHAPTER 9: Data-Channel Configuration 101 E XTENDED F EATURES The Extended Features Menu is accessed from theAsync Channel Menu as option 3. The current configuration for each menu option isdisplayed in brackets. Each of these features isexplained in Table 9-12 .To return to the previous menu ( ASYN...

Multiserver 5000 102 9.4 Copy Channel Parameters By using the Copy Channel Parameters selection,you can configure a range of sync or async ports ora single port. If the next port(s) to be configuredmatches (or closely resembles) the one previouslyconfigured, this option can save you time. NOTE: Sour...

CHAPTER 9: Data-Channel Configuration 103 9.5 Review Data-Channel Configuration R EVIEWING S YNC -C HANNEL C ONFIGURATION To review sync-data channels, enter the ViewConfiguration menu. Atthis prompt, enter the node ID, a slash, and a syncchannel or range of channels you wish to review.(Channel rang...

Multiserver 5000 104 R EVIEWING A SYNC -C HANNEL C ONFIGURATION To review async-data channels, enter the ViewConfiguration menu. At this prompt, enter the node ID, a slash, and anasync channel or range of channels you wish toreview. (Channel ranges should be in the form:starting channel, dash, endin...

CHAPTER 9: Data-Channel Configuration 105 9.6 Connecting Data Channels Cables In Appendix B , there are cabling diagrams that show each type of cable you will need for the CCMand all CEMs. All data-channel cables must beshielded. [node id] CHANNEL FEATURES COMMAND MODE PROCESSING FLOW SYNC ---------...

Multiserver 5000 106 This chapter discusses switching configurations forsynchronous and asynchronous data channels.Information on configuring Voice/Fax channelswitching can be found in the MS1 Voice/Fax Card User’s Manual . 10.1 Switching Control The Switching Control menu is accessed from theComman...

CHAPTER 10: Switching Configuration 107 Table 10-1. Switching Control (continued) Option Description 2. Enable Channel This option returns an out-of-service async or voice/fax channel (or range of channels) tothe idle state. When this selection is chosen, the following prompts will appear on thescre...

Multiserver 5000 108 Table 10-1. Switching Control (continued) Option Description 4. Force Disconnect Disconnects two ports which have been force-connected. This option also permitsremoval of a port from the queue. When this selection is chosen, the following promptwill appear on the screen: ENTER N...

Multiserver 5000 110 disconnecting ranges, see Section 10.3, Force Connecting a Range . 10.3 Force-Connecting a Range The procedures for force-connecting async and syncchannels are the same. The two ports to beconnected must be the same type of port (i.e., asyncto async, sync to sync, or voice to vo...

CHAPTER 10: Switching Configuration 111 voice-voice, async-async, sync-sync connections willbe made. If the “from” range is greater than the “to” range,the unpaired from ports will not be connected. E XAMPLE OF F ORCE -C ONNECTING A R ANGE In the example in Figure 10-3 , a user will attempt to force...

Multiserver 5000 112 10.5 Asynchronous Connections The following five methods of switching aresupported for async ports: Force The network operator configures a Connection dedicated connection between twoports in the network. Fixed The network operator configures Destination the destination for the ...

Multiserver 5000 114 Note: The wild card (*) can be used to access arange of ports. To access any async port in theMultiserver identified by the nameNEW_YORK, you would type the following: NEW_YORK/* 2. The CLASS PASSWORD prompt will appear on the screen. If the destination port has beenconfigured a...

CHAPTER 10: Switching Configuration 115 10.7 Asychronous-Channel Switching Parameters Control of async-channel switching capability isconfigured through the Switching Parametersmenu. To access this menu, follow this menusequence: Enter the appropriate information and press <cr> . The Switching...

Multiserver 5000 116 Table 10-2. Switching Parameters Option Default Description 1. Connect Protocol Dedicated Selects the communication protocol used. The protocol must becompatible with the attached device. There are three options: Dedicated — This option is used for terminals or computer ports wh...

CHAPTER 10: Switching Configuration 119 MULTISERVER 5000 PBX HOST FAX ASYNC TERMINAL COMMAND FACILITY MULTISERVER 1000 MULTISERVER 1000 MULTISERVER 1000 To C1 and C2 To D1 and D2 To E1 and E2 PHONE A6 OTHER TERMINALS CONNECTED TO HOST A1 A2 A3 FAX PHONE A2 A3 A4 A5 B1 B2 B1 B2 B3 B4 B5 B6 FAX PHONE ...

Multiserver 5000 120 E XAMPLE OF A S WITCHING C LASS Figure 10-4 shows a Multiserver network. The Central Office has a Multiserver 5000 with a 6-channel CEM and 3 Voice/Fax cards. This will beconsidered the local node. Each remote office hasa Multiserver 1000 with one Voice/Fax card. In this applica...

CHAPTER 10: Switching Configuration 121 The Class Parameters menu appears: Each of the menu options are explained in Table 10-3 . To include a port as part of a class, select option 7from the Switching Parameters Menu (see Section 10.7, Asynchronous Switching Parameters , and Table 10-2 ) and insert...

Multiserver 5000 122 Table 10-3. Class Configuration (continued) Option Default Description 3. Class Password None Password protection is available for all ports assigned to a class. If a passwordis assigned, the user will be prompted for the class password before beingallowed to continue. After two...

CHAPTER 10: Switching Configuration 123 Table 10-3. Class Configuration (continued) Option Default Description 5. Class No Activity 0 The no activity feature monitors the class channel and, after a specified Disconnect period of time, if there is no activity on the channel, it will be disconnected. ...

Multiserver 5000 124 10.9 Connect Protocol Details Connect protocol is option 1 of the SwitchingParameters menu. There are three connectprotocol options: Dedicated, Auto, and DTR. Adiscussion of the protocols and how to configurethem is in Section 10.7, Asychronous Channel Switching Parameters , and...

CHAPTER 10: Switching Configuration 125 For Dual port Idle State: DTR can be high or low . The Multiserver holds DSR, CTS, CD,and RI low . 1. Multiserver raises DSR, CTS, and CD. 2. If DTR is high , no response is required. If DTR is low , device must raise DTR within 60 seconds. 3. If ABR is enable...

Multiserver 5000 126 or Initiated by Multiserver (or remote end): 1. Calling device disconnects. 2. Multiserver drops CTS, DSR, and CD. 3. Port is marked out-of-service until device acknowledges disconnect by droppingthen raising DTR. A UTO (A NSWER ) P ROTOCOL Call Request ( Calling port attached t...

CHAPTER 10: Switching Configuration 127 10.11 X.21 Switching Considerations There is no special async channel configurationrequired for use with X.21, with the followingpossible exception. A special configuration isrequired if you are trying to connect a port on theMultiserver that requires a DTR pr...

Multiserver 5000 128 For additional information on configuring yourport parameters, refer to Section 9.3, Asychronous Channels , and for classes, refer to Section 10.8, Classes . You may wish to view the async channelconfiguration (see S ection 10.12, Review Asynchronous Switching Configuration ) to...

CHAPTER 10: Switching Configuration 129 10.12 Review Switching Configuration for an Async Channel To review the switching parameters of asyncchannels, enter the View Configuration Menu. At this prompt, enter a channel or range ofchannels (for example, DENVER/a2-a6). The Multiserver will display the ...

Multiserver 5000 130 System administration can be done through thededicated command port on the NMS module or afloating command port. This chapter assumes youare using a floating command port. 11.1 Reset A reset may be necessary to clear a channel, node,or link. The reset causes the software to retu...

CHAPTER 11: Administration 131 After you have entered the correct channel, pressthe EXEcute key. To reset to a Default or Current Configuration,press the EXEcute key at the appropriate screen.You will be asked ARE YOU SURE? If you are, press the EXEcute key again. Press any of the arrowkeys to abort...

Multiserver 5000 132 Table 11-1. Reset Options Option Description 1. Node Disconnects the Command Facility and resets the local Multiserver node, all locallyconnected channels, and locally attached feeder muxes. Remote Multiservers and feedermuxes will not be reset by this option. If a port has been...

CHAPTER 11: Administration 133 11.2 The Command Mode The Command Mode is a single menu whichsupports configuration and testing of the local portand access to the Command Facility Main Menu.The local port is defined as the one to which theterminal you are using is connected. E NTERING THE C OMMAND M ...

Multiserver 5000 134 Table 11-2. The Command Mode Option Description 1. Async Channel A selection of loopback tests. See Section 12.3, Async Channel Loopback in the Loopback Command Mode , for a complete discussion of the tests. 2. Local Channel Provides control and modification of the locally conne...

CHAPTER 11: Administration 135 11.3 Configuring the Command Facility The Command Facility Parameters Menu controlsthe system time, date, system reports, externalmodem (if an NMS module is installed), No Activitytimeout, and the LCD Banner message. If an NMS module is installed, refer to the NMSmanua...

Multiserver 5000 136 Table 11-3. Command Facility Configuration Option Default Description 1. Time 00:00:00 The system time. At power-up, the Multiserver requests the time fromlocally attached feeder muxes to make sure that the network agrees onthe time of day. If there are no local feeder mux units...

Multiserver 5000 138 Table 11-3. Command Facility Configuration (continued) Option Default Description 8. Output Periodic Local Remote Node . Periodic reports are output to a remote node. If remote Report Command node is selected, the node ID must be named in option 9. If no remote (continued) Port ...

Multiserver 5000 140 11.4 Messages A LARM M ESSAGES Alarms generally indicate that an error has beendetected that impacts or degrades the performancefor part of the network. For example, an alarmmessage would be sent if the line error rates wereexcessive, or if a link went down. To clear an alarm, s...

CHAPTER 11: Administration 141 will accept the entry, and the following promptappears: Enter up to 45 characters, including spaces andpunctuation. Special rules apply when entering the characters shown in Table 11-4 into the broadcast message. After the message is finished, press <cr> . If you...

CHAPTER 11: Administration 143 Table 11-5. Dialog Messages (continued) Max Option Default Char Description 11. Unassigned UNASSIGNED 17 Sent when a node, class, or port is unknownin the network. It could also mean that apassword for the class may be incorrect.(This message generally indicates a typi...

Multiserver 5000 144 11.5 Network Security Protecting selected portions of the Command Modeand the Command Facility involves two types ofsecurity: password protection and lock-outconfiguration. P ASSWORDS Passwords are security protection for theMultiserver. Four types of password protection canbe a...

Multiserver 5000 146 11.6 Status/Statistics Status and statistics reports are available on theStatus/Statistics Menu. Status is a snapshot of thesystem as it appears the moment the request ismade; statistics are a readout of the system within adefined period of time. You will use the Status/Statisti...

CHAPTER 11: Administration 147 Table 11-7. Status/Statistics (continued) Option Description 2. Channel Status(continued) 3. Interface Status This option is used to view the states of the control signals of a single data channel onthe local Multiserver. When you select this option, the following prom...

Multiserver 5000 148 Table 11-7. Status/Statistics (continued) Option Description 4. Queue Status Lists all the class numbers, class names, and the node ID/channel of the ports queuedto each class. This will display up to 30 ports per class. All 64 classes will display,whether or not they are config...

CHAPTER 11: Administration 149 5. Voice/Fax Status If the Multiserver is equipped with a voice/fax module, this option will display a range ofports selected, the input level, the mode (on hook, off hook, busy), the softwarerevision, and, if applicable, the test mode and test status. When this option...

Multiserver 5000 150 Table 11-7. Status/Statistics (continued) Option Description 7. System Statistics Provides two options: the period report (the report compiled during the last reportingperiod) or a demand report (a snapshot of the system at the time of request). [node id] LAST PERIOD REPORT TIME...

CHAPTER 11: Administration 151 Table 11-7. Status/Statistics (continued) Option Description System status is displayed as a set of statistics in a single report. The statistics reflect system activities that have occurred since the last reporting interval. (If no reportingperiod is defined in the Co...

Multiserver 5000 154 11.7 Link Administration R ESET If a link is not working properly (interconnect,mux, or X.21), it can be reset. If the other end ofthe link is a feeder mux, the mux will also reset. Allchannels currently using the link will experience atemporary interruption. See Section 11.1, R...

Multiserver 5000 156 Table 11-7. Status/Statistics (continued) Option Description 8. Channel Statistics Channel Statistics are part of the System Statistics (see option 7 above). When thisoption is chosen, the current channel statistics for the node are displayed. Voicechannels and integral devices ...

CHAPTER 12: Diagnostics 157 12.1 Self-Test The self-test checks the operation of all systemmemory. The Multiserver automatically executes aself-test when power is first turned on or when thesystem is reset. All LED indicators turn ON and theMultiserver does a RAM and ROM check. The portindicators st...

Multiserver 5000 158 test. The integrity of the components involved inthe test can be judged by observing the quality ofthe returned data (see Figure 12-2). To end thetest, press ^X^Y or <break> . You will be returned to the Command Mode. The terminal must be connected to a remote portfor this...

CHAPTER 12: Diagnostics 159 12.4 System Diagnostics in the Command Facility The system administrator may perform all of thefollowing diagnostics from the Command Facility.Some of the tests may also be performed at theLCD/Keypad. Section 13.6, Diagnostics , explains each of the diagnostic functions t...

Multiserver 5000 160 Enter the channel to be tested. Press <cr> . These tests are performed only on async ports fromthe user terminal. The menu options are the sameas the Async Channel Loopback in CommandMode. Section 12.3, Async Channel Loopback in Command Mode , explains each of these tests....

CHAPTER 12: Diagnostics 161 The Fox Message Test causes a continuous fox message to be output to the test port. The port thatis being tested will not be able to accept any otherinstructions as long as the test continues. Thefollowing will appear on your screen: The fox message will not echo back to ...

Multiserver 5000 162 The following menu will appear: After the test is initiated, the Command Facilityterminal will be returned to the Command Facilitymain menu. On the attached synchronous device,all characters entered will be echoed back to itself.Integrity of the port and the terminal may bejudge...

CHAPTER 12: Diagnostics 163 12.5 Testing the Network In a Multiserver network, there are several loopbackand test-pattern tests that you can use to diagnosethe integrity of various segments of the network.The modules in a Multiserver have diagnostic testsinitiated by those units; detailed informatio...

CHAPTER 13: LCD/Keypad 165 13.1 General LCD/Keypad Information The Multiserver 5000 has an LCD (Liquid CrystalDisplay) and a keypad on the front of the unit. The80-character LCD consists of two 40-character lines.The LCD is used to display status and alarmmessages, as well as diagnostic and minimalc...

Multiserver 5000 166 LCD B LINKING B ACKLIGHT When working in the menus, should the backlightbegin blinking, it means that there is an alarmmessage. You can exit to the top level (BannerMessage Display) and read the message or just clearthe blinking backlight. This is how to clear the blinking backl...

CHAPTER 13: LCD/Keypad 167 Banner Message Section 13.2 Review System Message Log Section 13.3 Menu Functions (password) Section 13.4 Administration Section 13.5 System Clear Latched Alarms Default Configuration Current Configuration System Controlled Forced On Forced Off Local Loopback Digital Loopb...

Multiserver 5000 168 C HANNEL N UMBERS When the LCD display requests you for a channelnumber, use the following keys as shown. The default channel number display is A01; thecursor will be positioned beneath the A. • If the port desired is A5, you will not change the A. Move the cursor right with the...

CHAPTER 13: LCD/Keypad 169 C ONFIGURING THE B ANNER M ESSAGE The factory default message for the LCD is NameYour Node. This message can be customized at anasync terminal operating in the Command Facility.Follow these procedures: At this prompt, enter the LCD Banner Message.The message may be a maxim...

Multiserver 5000 170 V OICE /F AX If a voice/fax module is installed, this menu offersthe following two options: Option Description Reset Resets the selected voice/fax Channel channel. Busy Mode Controls how the busyout state ofthe channel is determined. B USY M ODE This menu offers the following op...

CHAPTER 13: LCD/Keypad 171 Press Key Resulting Display The node number appears in the brackets. (Thenumber shown above in the brackets is the defaultnode number.) The cursor will be in the farthestnumeric position to the right. Configure the nodenumber using the keypad as explained below: If you cho...

Multiserver 5000 172 This menu offers the following test options: Option Description Sync Causes a sync port to be placed in Channel local echo loopback similar to the Loopback async echo. WARNING : This test will interrupt all channels connected across thelink. Remote Sets up the unit to expect its...

Multiserver 5000 174 Display voice/fax signal. The indicatorlights on the voice/fax module showthe level (see Figure 13.5 ). When this test is initiated, the display willread [Active] . Terminate Terminates all the tests initiated at Test this menu. Once a test is initiated, an [Active] message is d...

Multiserver 5000 176 Node # NODE ID PORT A1 Node # NODE ID A2 Node # NODE ID A3 Node # NODE ID A4 Node # NODE ID A5 Node # NODE ID Worksheet for Planning Node Numbers and Node IDs

Appendix A: Worksheets 177 Local CCM CCM Remote CCM CCM Worksheet for Recording Optional Modules and their Connectors

Multiserver 5000 178 NODE ID (name) Channel Protocol Data Channel Max. Max. Interface Carrier Sync Number Rate Clocking Transmit Receive Type Mode Char. Block Block Size Size continued on facing page → Synchronous Protocol and Channel Worksheet

Appendix A: Worksheets 179 continued from ← facing page Number Pad Number Number Encoding Idle Buffer Clock DSR of Char. of of Fill Control Flow Ctrl. Leading Leading Trailing Control Syncs Pad Chars. Pad Chars. NODE ID (name) Synchronous Protocol and Channel Worksheet (continued)

Multiserver 5000 180 NODE ID (name) Channel Data Code Parity Stop Echo To Host/ Number Rate Level Bits To Terminal continued on facing page → Asynchronous Channel Characteristics Worksheet

Appendix A: Worksheets 181 continued from ← facing page X-ON X-OFF Buffer Flow CR LF FF Char. Char. Ctrl. Ctrl. Delay Delay Delay NODE ID (name) Asynchronous Channel Characteristics Worksheet (continued)

Multiserver 5000 182 NODE ID (name) Channel Priority EIA Smooth Tandem Flow- HP Number Ctrl. Scroll Control Strip ENQ/ACK Asynchronous Channel Features Worksheet continued on facing page →

Multiserver 5000 184 NODE ID (name) ChannelNumber Data Compression Remote CTS Control Asynchronous Channel Extended Features Worksheet

Multiserver 5000 186 NODE ID (name) Option Entry Connect Protocol Unbalanced Rates Call Inhibit Receive Inhibit Character Set Matrix Switching Resource Class Destination Node/Class Channel Password Switching Parameters Worksheet

Appendix A: Worksheets 187 Option Entry Event Reporting Alarm Reporting Switch Statistics Reporting Periodic Reporting Interval Output Event/Alarm Reports Output Periodic Report Remote Node ID External Modem Priority External Modem Phone # External Alarm No Activity Timeout LCD Banner Message NODE I...

Multiserver 5000 188 Option Entry Channel Password Welcome Class Request Class Password Connected Queue Busy Disconnected Now Answer Unavailable Unassigned Incompatible Call in Progress NODE ID (name) Display Messages Worksheet

Appendix A: Worksheets 189 Option Entry Mode Digitizing Rate Input Level Gain Output Level Attenuation Busyout Mode Bandwidth Background Priority Number of Rings Signalling Format Analog Operation Ringing Frequency Number of Digits NODE ID (name) Voice/Fax Parameters Worksheet

Multiserver 5000 190 NODE ID (name) Option Entry Global Status LCD/Keypad Class Number Class Name Class Password Node ID Channel Number User Channel Password Record of Passwords

Appendix B: Cabling Diagrams 191 This appendix contains cabling diagrams for the following: • Cabling for the CCM and 6-Channel CEMs (p. 192 ) • Cabling for the 12-Channel CEM (p. 198 ) • Cabling for the 12-Channel CEM with Line Drivers (p. 202 ) • Cabling for the MS1 56K CSU/DSU Module (p. 204 ) • ...

Multiserver 5000 192 Cabling for the CCM and 6-Channel CEMs CCM 6-CHANNEL CEM PROTECTIVE GROUNDTX DATARX DATARTS (REQUEST-TO-SEND)CTS (CLEAR-TO-SEND)DSR (DATA SET READYSIGNAL GROUNDCD (CARRIER DETECT)UNASSIGNEDTX CLOCKRX CLOCKEXTERNAL RX CLOCKDTR (DATA TERMINAL READY)RI (RING INDICATOR)EXTERNAL TX C...

Multiserver 5000 198 12-CHANNEL CEM (DCE) 1 2 3 4 5 6 7 8 RJ-45 PIN ASSIGNMENTS PIN 1 RJ-45 RING RLSD DTR GND RXD (DATA OUT) TXD (DATA IN) CTS RTS Cabling for the 12-Channel CEM

Multiserver 5000 202 12-CHANNEL CEM WITH LINE DRIVER (DCE) BLACK RED GREEN YELLOW RX+ RX- TX- TX+ TX+ TX- RX- RX+ 1 2 3 4 5 6 7 8 RJ-45 PIN ASSIGNMENTS RS-422 CUSTOMER EQUIPMENT BLACK RED GREEN YELLOW RX+ RX- TX- TX+ TX+ TX- RX- RX+ 1 2 3 4 5 6 7 8 RJ-45 PIN ASSIGNMENTS RS-423 CUSTOMER EQUIPMENT (DA...

R1 T1 T R 1 2 3 4 5 6 7 8 RJ-48 PIN ASSIGNMENTS 56K DIGITAL NETWORK PIN 1 RJ-48 PIN 8 Multiserver 5000 204 LEAVE A1 EMPTY RJ-48 CONNECTOR RJ-48 AT BOTH ENDS OF CABLE CSU/DSU 1 2 4 5 6 A B C D E 3 1 2 3 4 5 6 7 8 9 10 11 12 12 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 1 KTS OPX SB M E SG R1 T1 R T VO...

Multiserver 5000 206 Cabling for Converters DB25 (RS-232) DCE CONVERTER 1 2 4 5 6 A B C D E 3 1 2 3 4 5 6 7 8 9 10 11 12 12 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 1 KTS OPX SB M E SG R1 T1 R T VOICE CHANNEL 2

Multiserver 5000 210 Figure B-13. Tandem Cable Diagram. Cabling for Use with Tandem 1 2 3 4 5 6 7 8 20 22 25 1 2 3 4 5 6 12 7 8 20 22 25 25-PIN CONNECTOR (MALE) 25-PIN CONNECTOR (FEMALE) CONNECTS TO TANDEM CPU BUSY RING ADAPTER DATA TERMINAL READY DATA CARRIER DETECT GROUND T-PAUSE DATA SET READY CL...

Appendix C: Defaults 211 System Administration Port Configuration Menu Item Default Port A1 ..................................................................................Interconnect LinkAll others ...............................................................................Async ChannelLink R...

Multiserver 5000 212 System Administration (continued) Command Facility Parameters Menu Item Default Event Reporting ....................................................................OffAlarm Reporting....................................................................OnSwitch Statistics Reporting...

Appendix C: Defaults 213 Asynchronous Channel Configuration Channel Characteristics Menu Item Default Data Rate .............................................................................9600 bpsCode Level ...........................................................................8Parity: If Code ...

Multiserver 5000 214 Synchronous Channel Configuration Channel Characteristics Menu Item Default Sync Protocol .......................................................................DLC DLC Data Rate .............................................................................2400 bpsChannel Clockin...

Appendix C: Defaults 215 Synchronous Channel Configuration (continued) RTS/CTS Menu Item Default Data Rate .............................................................................2400 bpsChannel Clocking .................................................................TX-Internal/RX-InternalMax...

Multiserver 5000 216 Synchronous Channel Configuration (continued) H-P Sync Menu Item Default Data Rate .............................................................................2400 bpsChannel Clocking .................................................................TX-Internal/RX-InternalMaximu...

Appendix C: Defaults 217 Synchronous Channel Configuration (continued) TDM Menu Item Default Data Rate .............................................................................2400 bpsChannel Clocking .................................................................TX-Internal/RX-InternalInterfa...

Appendix C: Defaults 219 Voice/Fax Module (continued) Voice/Fax Node Parameters Menu Item Default Number of Digits (for extension numbers) ...........................2 Voice/Fax Switching Parameters Call Inhibit .............................................................................NoReceive I...

Multiserver 5000 220 NMS Module Command Port Menu Item Default Data Rate .............................................................................ABRCode Level ...........................................................................8Parity.........................................................

Appendix D: Messages 221 The messages are divided into two categories, screen display messages and LCD messages. Included in theselists are messages received from all the optional modules. Screen Display Messages M ESSAGE T YPE : Alarm Vital to the system’s operation; may cause an interruption to th...

Multiserver 5000 222 ni ADB PROCESS ABORTED Event An attempt to place a call on the dial lines has LINK # ci failed. This message is displayed by the calloriginating modem. APPLICABLE TO RTS Info In trying to configure an Integral LAN module, FUNCTIONALITY ONLY you have selected a module location wh...

Appendix D: Messages 223 CHANNEL NOT INSTALLED Info An attempt has been made to configure or test avoice/fax port and the port number selected is not avoice/fax port. CHANNEL(S) NOT Info An attempt has been made to view the status INSTALLED or configuration of a range of ports that are notvoice/fax ...

Appendix D: Messages 233 VOICE CHANNEL [ n/c ] Event Voice/fax port c on node n has cleared TEST CLEARED (stopped) the current diagnostic test. <WAITING Q= n > Dialog Sent whenever the port is placed in a queue (afterrequesting a class which is busy). This messagewill appear whenever a printab...

Multiserver 5000 234 LCD Messages M ESSAGE T YPE : Alarm Vital to the system’s operation; may cause an interruption to that operation. Event Occurs in the regular operation of the system; most likely will not affect the system’soperation. Info Informational. K EY : cl = Class name or MATRIX if matri...

Appendix E: Indicators 239 Appendix E: Indicators A6 A5 A4 A3 A2 A1 AT BO Figure E-1. CCM Indicator Positions. CCM LED Indicator Indicator Definition Off Flashing On AT Active Mode Indicates a fault or The unit is in a loopback Normal operation test condition test mode BO Buffer Overflow Buffer util...

Appendix E: Indicators 241 CCM LED Indicator Indicator Definition Off Flashing On n 1 through n 12 Channel number No data activity Data activity Data activity n = module location B through D (a CEM may not be placed in module location E) NOTE: On a force-connected sync port using either Fast Packet ...

Multiserver 5000 242 LED Indicator Indicator Definition Normal Operation Input Level Display Loopback Self-Test OK OK On or flashing On Off On if successful; Off or Flickering if unsuccessful LO Local Off-Hook On or Off -25 dBm through -16 dBm* On Off RO Remote Off-Hook On or Off -15 dBm through -5 ...

Multiserver 5000 244 LL RT SI RD TD Figure E-5. CSU/DSU Module Indicator Positions. LED Indicator Indicator Definition Off Flashing On LL Local Loopback Normal operation Local Loopback Test --- is active RT Remote Terminal Normal operation Digital Loopback or Remote --- Terminal Loopback Test is act...

Appendix F: Device Applications 245 Extended WANG Support Feature (WANGX) The extended WANG support feature (WANGX)provides special buffer control, flow control, andcode levels for WANG 2200 computer systemssupport. These systems include 2200 UP, 2200 MUP,and 2200 LVP all using the 2236 MXD terminal...

Multiserver 5000 246 • HP port should be enabled when Term Type 10 is configured by the CPU or the terminal user. • Do not define the DC2 character for either X-ON or X-OFF when using X-ON/X-OFF flowcontrol for Hewlett-Packard systems. • For ENQ/ACK protocol to function properly, one port must be se...

Appendix G: Rackmount Installation 247 The MS1 Rackmount Kit consists of the followingitems: • One rackmount tray • Four screws • Four washers—nylon filler • Four washers—nickel finish • Four clip nuts Here is how to install your Multiserver unit in a 19-inch rack using the MS1 Rackmount Kit: 1. Ins...

APPENDIX H: Additional Information 249 UPGRADE INFORMATION from Phase 2.5 to Phase 3.0 When upgrading from a Phase 2.5 to a Phase 3.0FEATUREPAK_ cartridge, a cold start is notrequired. The configuration remains intact. Withthe async channel parity conversion feature, youmust insure that you have eac...

APPENDIX H: Additional Information 251 Network Management System (NETMan) MICOM’s NETMan is a software package for PCsthat manages Marathon networks. This productcomes in two versions: NETM- an I (manages up toten nodes) and NETMan III (manages more thanten nodes and up to 254 networks). A node, in ...

Multiserver 5000 252 ABR, autobaud rate detection — A process by which a receiving device determines the data rate,code level, and stop bits of incoming data byexamining the first character received (usually apreselected sign-on character). ABR allows areceiving device to accept data from a variety ...

Glossary 257 Multiserver network. On incoming calls, the faxsignals are routed automatically from either thePSTN or the Multiserver network to the faxmachine. On outgoing calls, the desireddestination network for the fax machine isselected by the user. FCC — A government board that has the power to ...

Glossary 261 RS-422 — An EIA-recommended standard for cable lengths that extended the RS-232 50-foot limit.Although introduced as a companion standardwith RS-449, RS-422 is most frequentlyimplemented on unused pins of DB25 (RS-232)connectors. Electrically compatible with CCITTrecommendation V.11. RS...

Glossary 263 VF, voice frequency — Any frequency within that part of the audio-frequency range essential forthe transmission of speech of commercialquality (300-3000 Hz). This is the frequencyrange used over telephone lines. voice compression — A method of minimizing bandwidth by reducing the number...

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