Ringing Hardware - Nortel DMS-100 Series General Description Manual

Ringing hardware

The SCM-100U/RCU ringing system involves the hardware components listed
in the following table.
Table 3-1 SCM-100U ringing hardware
Peripheral
SCM-100U
RCU
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.
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 3-2 SCM-100U ringing hardware component description
Component
NT6X02
NT6X80
NT6X85
Component PEC Component Name
NTMX77 Unified processor
NT6X80 Ring/pad
NT6X85 DS-1 interface
NT3A86 DS-1 interface
NT3A31 Control processor
NT3042 Timing
NT3A39 Ringing generator
Description
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.
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.
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.
Ringing in Series II peripherals 3-3
DMS-100 Ringing System