
Ringing in Series II peripherals 3-5
DMS-100 Ringing System
In the event that the monitor circuit detects a fault, the monitor and alarm
circuit raises a ringing generator alarm and operates the switchover relays to
switch the standby ringing generator to the active ringing generator. The
monitor and alarm circuit then activates a shut-down circuit in the faulty
ringing generator, which disconnects the faulty generator from the power
source and lights the shut-down light-emitting diode (LED) on the ringing
generator faceplate. The faulty ringing generator can be reset manually by the
reset switch.
If the power converter on the other side has failed, an automatic reset circuit
on the faulty ringing generator automatically attempts to restart the faulty
generator every 10 seconds.
SCM-100R
The SCM-100R provides a digital interface to the remote concentrator
terminal (RCT) of the DMS-1R system.
The SCM-100R was introduced into the DMS-100 system by feature package
NTX213. Feature package NTX213 is documented in Subscriber Carrier
Module-100 Rural General Description.
Ringing types supported by SCM-100R
The SCM-100R supports the following types of ringing:
• coded
• superimposed
• frequency selective
SCM-100R/RCT ringing configuration
The SCM-100R/RCT ringing configuration is shown in the following figure.
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