General DataComm Megamux Plus 036M241 Technische Daten

ATTENTION!

STATIC SENSITIVE DEVICES

PROPER HANDLING AND GROUNDING

PRECAUTIONS REQUIRED

This equipment contains electrostatic sensitive devices. Use ESD pre-

cautionary procedures when removing or inserting parts or printed

circuit (pc) cards. Keep parts and pc cards in their antistatic packaging

material until ready to install.

The use of an antistatic wrist strap, connected to the grounded

equipment frame or chassis, is recommended when handling pc cards

during installation, removal, or setting of on-board option switches. Do

not use a conductive tool, such as a screwdriver or paper clip, to set

the position of the option switches.

MEGAMUX PLUS

7,0(#',9,6,21#08/7,3/(;(5

(GDC PART NO. 036M241)

This product was designed and manufactured by

General DataComm, Inc. (GDC)

Middlebury, Connecticut 06762-1299

WARNING

This equipment generates, uses, and can radiate radio frequency energy and if not

installed and used in accordance with the instruction manual, may cause

interference to radio communications. It has been tested and found to comply with

the limits for a Class A computing' device pursuant to Subpart J of Part 15 of FCC

Rules, which are designed to provide reasonable protection against such

interference when operated in a commercial environment. Operation of this

equipment in a residential area is likely to cause interference, in which case the

user at his own expense will be required to take whatever measures may be

required to correct the interference.

CRC-REQUIRED NOTIFICATION

This equipment is a Class A digital apparatus which complies with the Radio

Interference Regulations, CRC c.1374.

PUBLICATION NOTICE

This manual has been carefully compiled and checked for accuracy. The

information in this manual does not constitute a warranty of performance.

Furthermore, GDC reserves the right to revise this publication and make changes

from time to time in the content thereof. GDC assumes no liability for losses

incurred as a result of out-of-date or incorrect information contained in this

manual.

READERS COMMENTS

Comments regarding this manual should be addressed to:

Publication Department

Tech Center

General DataComm, Inc.

Middlebury, Connecticut

06762-1299

PROPRIETARY NOTICE

This publication contains information proprietary and confidential to General

DataComm, Inc. Any reproduction, disclosure, or use of this publication is

expressly prohibited except as General DataComm, Inc., may otherwise authorize

in writing.

Rev. 4, October 1986

FCC-REQUIRED NOTIFICATION

FOR USERS OF FCC-REGISTERED EQUIPMENT

Read before using this technical manual or installing subject equipment.

This equipment complies with Part 68 of the Federal Communications Commission (FCC) Rules and

Regulations. Connection of data communication equipment to the public telephone network is regu-

lated by the FCC Rules and Regulations. These regulations require:

A. All connections to the telephone network must be made through standard plugs and telephone

company provided jacks or equivalent.

B. Connection of this equipment to party lines and coin telephones is prohibited

C. If the telephone company asks you what equipment is connected to the telephone line, tell them to

which line the equipment is connected, and give them the FCC Registration number and Ringer

Equivalence number of the equipment. These numbers can be found on a label located on the

back of the front panel on all DataComm-type equipment and on the underside or rear panel of

other equipment.

D. If you experience trouble, disconnect the equipment from the telephone line to determine if the

equipment is malfunctioning. If it is, remain disconnected until the problem is corrected. Should

this equipment cause harm to the telephone network, the telephone company may discontinue

your service temporarily. If possible they will notify you in advance. But if advance notice is not

practical, you will be notified as soon as possible. You will be informed of your right to file a

complaint with the FCC.

E. The telephone company may change its communication facilities, equipment, operations, and

procedures where reasonably required for operation. If this occurs, the telephone company will

notify you in writing.

F. IL is the user's obligation to notify the telephone company prior to disconnecting equipment

from 1.544 Mbps digital service.

G. According to Part 68 of the FCC Rules and Regulations, customers are not authorized to repair or

modify this equipment. Any repair or modification will null and void the FCC registration and the

warranty of this equipment.

CANADIAN DEPARTMENT OF COMMUNICATIONS (DOC) REQUIRED

NOTIFICATION

FOR USERS OF DOC-CERTIFIED EQUIPMENT

Read before using this technical manual or installing subject equipment.

The Canadian Department of Communications label identifies certified equipment. This certification

means that the equipment meets certain telecommunications network protective, operational, and safety

requirements. The Department does not guarantee the equipment will operate to the user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facili-

ties of the local telecommunications company. The equipment must also be installed using an acceptable

method of connection. In some cases, the company's inside wiring associated with a single line individual

service may be extended by means of a certified connector assembly (telephone extension cord). The

customer should be aware that compliance with the above conditions may not prevent degradation of

service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility desig-

nated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment mal-

functions, may give the telecommunications company cause to request the user to disconnect the

equipment.

Users should ensure for their own protection that the electrical ground connections of the power utility,

telephone lines, and internal metallic water pipe system, if present, are connected together. This pre-

caution may be particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contact the appro-

priate electric inspection authority, or electrician, as appropriate.

036R660-E1

(55$7$#6+((7

FOR

MEGAMUX PLUS TDM

OPERATOR'S INSTRUCTIONS

Publication No. 036R660-000, Issue 9

OVERVIEW

The VLBRV (Very Low Bit Rate Voice) or VLBRV/FAX Channel Module is an analog voice

channel card for the MEGAMUX PLUS TDM. It provides voice encoding algorithms that max-

imize voice channel bandwidth utilization while offering low bit rate values of 9600, 4800 and

2400 bps. The VLBRV Channel Module is used in transmission applications to maximize avail-

able bandwidth. Applications include use in digital services such as ASDS (FT-1), ADN, satellite

and in feeder applications in which a customer needs to integrate both voice anddata. Voice com-

munication is two-way simultaneous (full duplex). The VLBRV Module mountsinto the MEGA-

MUX PLUS channel or expansion shelf.

This errata sheet covers all aspects of the VLBRV Channel Module configuration, diagnostics,

alarm and status scans as seen on the MEGAMUX PLUS supervisory controller screens.

DEFINING VLBRV CHANNEL PARAMETERS

Channel parameters are selected in a logical sequence. You must first specify the number of the

channel that you wish to configure. Once a channel number is selected, you enter the voice chan-

nel type. Once a channel type is selected, there are a range of parameters to be selected. You are

not allowed to select these parameters until a channel type is specified. Figure 1 shows how the

VLBRV channel parameters are configured.

FIGURE 1. CHANNEL PARAMETERS

Channel Number

The channel number associates a set of channel parameters with a VLBRV Channel Module in

the MEGAMUX PLUS TDM shelf. The channel number is determined by the positionof the VL-

BRV Channel Module in the shelf. Channel numbers range from 1 up to a maximum of 54 (you

must have one expansion shelf for a system with up to 38 channels, and two expansion shelves

for a 54-channel system).

CURRENT PARAMETERS FOR CHANNEL #01 CONFIGURATION AM

CHN CIRCUIT CIRCUIT BAUD T-R CLK TID-IR OR VF-DB-LEVEL I/F TID

# TYPE NAME RATE M/S DATA STOP M S TYPE MODE/DELAY

01 VLBRV MIKE1 9.6K ___ ___ 0.0 0.0 VC_1 ___

036R660-E1

Circuit Type

The circuit type entry defines the type of voice signal that the channel multiplexes. The selection is

determined by the equipment connected to the channel. The circuit type must also be supported by

the VLBRV Channel Module associated with the channel number. The VLBRV Channel Module

receives and transmits VF (Voice Frequency) signals. A primary task of the VLBRV Channel Mod-

ule is to convert input voice to a synchronous format, and convert output data to the original voice.

When using the VLBRV Channel Module, the circuit type is VLBRV or VLBRV/FAX.

Circuit Name

The VLBRV channel may be assigned a circuit name. This name is associated with the channel, and

appears in configuration, status, and diagnostics displays. Status and diagnostic routines that in-

volve the channel may be invoked by circuit name as well as circuit number.

Baud Rate

A baud rate is specified for every MEGAMUX PLUS channel. When a configuration is activated,

the TDM sends the entered baud rate to each VLBRV Channel Module which selects the proper

tinning signal from the MEGAMUX PLUS clock bus. For the VLBRV Channel Module, you can

select either 9600, 4800 or 2400 bps.

Transmit-Receive Clock

Not used on the VLBRV Channel Module.

TID-IR or Data/Stop Bits

Not used on the VLBRV Channel Module.

VF dB Levels

The output level of the VLBRV Channel Module is selected as a channel parameter. The level may

be specified in arange of +1.5 dB to-6.0dB, with 0.5 dB between each level (a total of 16 selectable

levels). Output levels are selected separately for Node M and Node S channel outputs.

This level is an adjustment to an absolute output level selected on the VLBRV Channel Module.

The output level is set to 0 dBm or +7 dBm by the position of a DIP switch. Generally, that switch

is set according to the requirements of the PBX or voice termination system to which the VLBRV

Channel Module is connected. The setting of this parameter adjusts the voice output above orbelow

the level set by the switch, to compensate for cable attenuation which offset the proper output levels

of the VLBRV channel. You may change this level as part of the Diagnostics routines. The Rcv dB

routine allows you to make the same level selections that are made when configuring the VLBRV

Channel Module. When either routine is complete, the controller asks whether changes to the output

levels should be changed. If changes are saved, the dB level entry for that channel configuration is

changed. This change occurs for the specified channel number in all stored configurations where

the channel is still configured far voice.

036R660-E1

Alarm Cut-Off (ACO)

The VLBRV has the capability to generate alarms indicating failures related to the VLBRV

Channel Module's operation. Alarms are indicated through front panel indicators, messages dis-

played in the system alarm scan, or by the VLBRV Channel alarm scan. When alarm cut-off

(ACO) is selected, the VLBRV Channel Module cannot report alarm conditions to the system.

ACO is useful when an alarm condition has been noted, but the VLBRV Channel Module con-

tinues to generate alarm messages. When ACO is implemented, it prevents further messages from

entering the Alarm Scan displays and filling message buffers. This ensures that the alarm scan

reports only new alarms, and reflect only new problems that occur in the network. When the VL-

BRV Channel Module is set for ACO, the Alarm indicator on its frontpanel remains litto indicate

this condition.

ACO may be selected for all VLBRV Channel Module's in a configuration. This action prevents

the reporting of channel alarms by the alarmscan. The alarm scan listcontains only major alarms

(those that indicate a system-level problem). When ACO is set On for all channels, it cannot be

turned Off again (except in version 3.20 and later) for all channels simultaneously; it may only

be turned Off on a channel by channel basis, or when a change is made to the configuration.

Interface Type (I/F Type )

The VLBRV Channel Module voice interface type arrangement supports E and M signaling. M

is an input control signal (input to the voice channel) and E is an output control signal. The signal

state of an M-lead at one channel interface is multiplexed through the system and transmitted at

the opposite end interface as an E-lead output. The interface type is identified as I/F type VC-1

(shown below).

I/F CONTROL [NAMES]

MODE M NODE S

SEND : M M

RCV : E E

Switches and jumpers on the VLBRV Channel Module selects one of the five E and M signaling

types.Each type is adifferent representation ofthe E and M On and Off statesusing voltage levels

or open and closed circuits. Since any of these types result in On or Off states for the signals, they

are not differentiated by the supervisory port display. You may display and change the states of

the EandM signals using Control State routines providedas part of the Diagnosticsroutines. This

feature allows you to disable the VLBRV Channel Module when required. However, if you save

changes made to the voice channel controls, the control states are changed in the channel config-

urationalso. Besure to notesuch changes ifyou makethem. A disabledVLBRV Channel Module

remains disabled until action is taken through Configuration or Diagnostics routines to restore

them.

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