Transmit data – Nortel Networks 1000 User Manual
Page 785
Architecture
785
The NTAK10 card interfaces to one DS-30X bus which contains 32
byte-interleaved timeslots operating at 2.56 Mb. Each timeslot contains 10
bits in a 10 message format; eight are assigned to voice/data (64 Kbps),
one to signaling (8 Kbps), and one is a data valid bit (8 Kbps).
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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.