Transmit data – Nortel Networks Circuit Card 311 User Manual
Page 887
Architecture
887
Transmit data
To transmit data on the carrier, the incoming serial bit stream from the
NTAK02 circuit 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 FAS pattern is sent in even TS0s, 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.
To transmit data on the carrier, the incoming serial bit stream from the
NTAK02 circuit 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 FAS pattern is sent in even TS0s, 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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.