STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
The SIGX block also provides an interrupt to indicate a change of signaling state
on a per channel basis.
9.14 Receive Per-channel Serial Controller (RPSC)
The Receive Per-channel Serial Controller (RPSC) function is provided by a
PCSC block.
The RPSC allows data and signaling trunk conditioning to be applied
independently on the receive stream on a per-channel basis.
9.15 T1 Signaling Aligner (SIGA)
The T1 Signaling Aligner can be positioned before the T1 basic transmitter to
provide superframe alignment of the signaling bits between the backplane and
the transmit DS-1 stream. The signaling alignment block maintains signaling bit
integrity across superframe boundaries.
9.16 T1 Basic Transmitter (XBAS)
The T1 Basic Transmitter (XBAS) block generates the 1.544 Mbit/s T1 data
stream according to SF, ESF, T1DM or SLC®96 formats.
In concert with the Transmit Per-Channel Serial Controller (TPSC), the XBAS
block 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. Robbed bit signaling control and selection of the signaling
source are also performed on a per-channel basis. All channels can be forced
into a trunk conditioning state (idle code substitution and signaling conditioning)
by use of the Master Trunk Conditioning bit in the T1 XBAS Configuration
Register.
A data link is provided for ESF, T1DM and SLC®96 modes. The data link
sources include bit oriented codes and HDLC 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 FDIS bit in the Transmit
Framing and Bypass Options 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.
PROPRIETARY AND CONFIDENTIAL
52
PMC [ PMC-SIERRA, INC ]
