STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
AUTOOOF:
The AUTOOOF bit allows global trunk conditioning to be applied to the
receive data stream, BRPCM, immediately upon declaration of out of frame
(OOF). When AUTOOOF is set to logic 1, while OOF is declared, the data on
BRPCM for each channel is replaced with the data contained in the data
trunk conditioning registers within RPSC. When AUTOOOF is set to logic 0,
the ingress data is not automatically conditioned by RPSC when OOF is
declared. However, if the RX-ELST is not bypassed, the RX-ELST trouble
code will still be inserted in channel data while OOF is declared if the TRKEN
register bit is logic 1. RPSC data and signaling trunk conditioning overwrites
the RX-ELST trouble code.
AUTOAIS:
If the AUTOAIS bit is logic 1, AIS is inserted in the receive path and the
signaling is frozen for the duration of a loss of signal condition. If AUTOAIS is
logic 0, AIS may be inserted manually via the RAIS register bit.
RUNI:
The RUNI bit selects the source of receive data. If RUNI is a logic 1, the
receive data stream and clock are expected to be presented on the RDAT
and RCLKI inputs, respectively.
If RUNI is a logic 0, the receive data and clock will be recovered from the
analog RXTIP and RXRING inputs. These inputs will typically be connected
to a signal transformer and may exhibit the attenuation and dispersion
characteristics of short or long haul lines.
BPV:
In T1 mode, the BPV bit enables only bipolar violations to indicate line code
violations and be accumulated in the PMON LCV Count Registers. When
BPV is set to logic 1, BPVs (which are not part of a valid B8ZS signature if
B8ZS line coding is used) generate an LCV indication and increment the
PMON LCV counter. When BPV is set to logic 0, both BPVs (which are not
part of a valid B8ZS signature if B8ZS line coding is used) and excessive
zeros (EXZ) generate an LCV indication and increment the PMON LCV
counter. Excessive zeros is a sequence of zeros greater than fifteen bits long
for an AMI-coded signal and greater than seven bits long for a B8ZS-coded
signal.
In E1 mode, the BPV bit enables only bipolar violations to indicate line code
violations and be accumulated in the PMON LCV Count Registers. (The
O162 bit in the CDRC Configuration register provides two E1 LCV
definitions.) When BPV is set to logic 1, BPVs (which are not part of a valid
HDB3 signature if HDB3 line coding is used) generate an LCV indication and
PROPRIETARY AND CONFIDENTIAL
83
PMC [ PMC-SIERRA, INC ]
