Change-of-state microprocessor, Carrier interface, Tx direction – Nortel Networks 1000 User Manual

Page 792: Rx direction

792

NTAK10 2.0 Mb DTI card

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

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.

The processor detects a valid change of state in TS16 and passes 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 sent 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 sent to the carrier. A
transformer provides isolation and impedance matching (75 ohms or 120
ohms).

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).

Rx Direction

The AMI data of the carrier is converted to digital and fed to the input
selector as well as the output selector for far end loopback. Clock recovery
circuitry within the receiving device extracts the 2.0 MHz clock. This clock
generates the frame and multiframe count and sends them to the clock
controller as a reference.The AMI data of the carrier is converted to digital
and fed to the input selector as well as the output selector for far end

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008