Carrier Interface - Meridian Nortel 1 Option 11C Technical Reference Manual

With the exception of the outpulsing signals and special signals, such as
Denmark's Flash signal and Sweden's Parking signal, the minimum duration
of any signal state is 100 msec. Some signal states may have a minimum
duration time that is longer than 100 msec.
Periodic Pulse Metering (PPM)
PPM is used to collect toll charges on outgoing CO trunk calls.
TS16 microprocessor
The functions of this microprocessor include:
• receiving signaling messages supplied by the DS-30X microprocessor,
decoding these messages, and taking subsequent actions
• transmitting messages to the DS-30X microprocessor
• handling PPM
• updating the TS16 select RAM and TS16 data RAM
• providing outpulsing
• receive data from the change-of-state microprocessor
• transmitting AIS for CNET (France) application
Change-of-state microprocessor
The functions of this processor are:
• detecting valid change of state in TS16.
• when a valid change has been found, passing the new abcd bits to the
TS16 microprocessor, along with five bits to indicate the associated
channel.

Carrier interface

Tx Direction
The HDB3 encoded multiplexer output is fed to the output selector, which
selects the PCM/Data output or the looped around far end data. The HDB3 is
converted from digital to AMI and fed to the carrier. A transformer provides
isolation and impedance matching (75 ohms or 120 ohms).
NTAK10 2.0 Mb DTI card
Option 11C and 11C Mini
Page 473 of 544
Technical Reference Guide