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Ringing in Series II peripherals 3-3

DMS-100 Ringing System

Ringing hardware

The SCM-100U/RCU ringing system involves the hardware components listed

in the following table.

SCM-100U components associated with ringing

A detailed functional description of the circuit cards in the SCM-100U can be

found by referring to the SMU Maintenance Manual A brief description of the

function of the SCM-100U circuit cards associated with the ringing system is

in the following table.

Table 3-1 SCM-100U ringing hardware

Peripheral Component PEC Component Name

SCM-100U NTMX77

NT6X80

NT6X85

Unified processor

Ring/pad

DS-1 interface

RCU NT3A86

NT3A31

NT3042

NT3A39

DS-1 interface

Control processor

Timing

Ringing generator

Note:

Line card controllers and line cards are also part of the ringing hardware in

the RCU. Refer to DMS-1U documentation for a complete listing of these

components.

Table 3-2 SCM-100U ringing hardware component description

Component Description

NT6X02 Control complex. The SCM-100U control complex

coordinates call processing between the RCU and the

DMS-100. The control complex directs the RCU to establish

connections, collect digits, apply ringing, and disconnect

calls under the direction of the DMS-100 CC.

NT6X80 Ring/pad. The ring/pad circuit card provides pulse coded

modulation (PCM) samples of ringing signals. The control

complex, upon determining the type of ringing required for a

given line, accesses the sample PCM signal from the

ring/pad card memory.

NT6X85 DS-1 interface. The DS-1 interface card converts parallel

data from the control complex to a serial format for

transmission over the DS-1 links to the RCU.

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