PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
indicating the next data byte is the first channel of the frame, or the first channel
of the first frame of the superframe.
8.17 BasicTransmitter (XBAS)
The Basic Transmitter function is provided by an XBAS.
The BASIC TRANSMITTER (XBAS) block generates the 1.544 Mbit/s T1 data
stream according to SF, ESF, T1DM, or SLC®96 formats.
A serial PCM control stream provides per channel control of idle code
substitution, data inversion (either all 8 bits, sign bit only, or magnitude only),
digital milliwatt substitution, and zero code suppression. Three types of zero code
suppression (GTE, Bell and DDS) are supported and selected on a per channel
basis to provide minimum ones density control. A serial signalling control stream
provides per channel control of robbed bit signalling and selection of the
signalling source. All channels can be forced into a trunk conditioning state (idle
code substitution and signalling conditioning) by use of the Master Trunk
Conditioning bit in the Configuration Register.
A data link is provided for ESF, T1DM and SLC®96 modes. Serial data input and
clock output allow a variety of data link sources including bit oriented codes and
LAPD messages. Support is provided for the transmission of framed or unframed
Inband Code sequences and transmission of AIS or Yellow alarm signals for all
formats.
PCM output signals may be selected to conform to B8ZS or AMI line coding.
The transmitter can be disabled for framing via the disable bit in the Transmit
Functions Enable register. When transmitting ESF formatted data, the framing bit,
datalink bit, or the CRC-6 bit from the input PCM stream can be by-passed to
the output PCM stream. Finally, the transmitter can be by-passed completely to
provide BPV transparency.
8.18 Transmit Per-Channel Serial Controller (TPSC)
The Transmit Per-channel Serial Controller allows data and signalling trunk
conditioning or idle code to be applied on the transmit DS-1 stream on a per-
channel basis. It also allows per-channel control of zero code suppression, data
inversion, and application of digital milliwatt.
The Transmit Per-channel Serial Controller function is provided by a PER-
CHANNEL SERIAL CONTROLLER (PCSC) block. The PCSC is a general
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
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PMC [ PMC-SIERRA, INC ]
