Nortel Networks 311 Transmit data

Architecture 887

Transmit data

Totransmit data on the carr ier,the incoming serial bit stream from the

NTAK02circuit card is converted to 8-bit parallel bytes. The signaling bits

are extracted by the signaling interface circuitry.

Digital Pad: The parallel data is presented to the pad PROM. The PROM

contains pad values, idle code, and A/µ-law conversion. They can be set

independently for incoming and outgoing voice on a per channel basis. Four

conversion formats are provided: A-law to A-law, A-law to µ-law,µ-law to

A-law, µ-law to µ-law.

Each of these four formats has up to 32 unique pad values. The NTAK10

card provides the pad values of -10, -9, -8, -7, -6,-5, -4, -3, -2, -1, 0, 0.6, 1,

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 dB (also idle and unassigned

code). A negative pad is a positive gain.

The pad PROM output is converted from parallel to serial format and passed

on to a multiplexer,which passes PCM/data, TS0, and TS16 information.

The FASpatter nis sent in evenTS0s, while in odd TS0s alarm information

is sent. The multiplexer output is fed to the carrier interface which can

forward it to the carrier or perform per channel loopback.