PM7345S Datasheet, PDF (246/306 Pages) PMC-Sierra, Inc – SATURN USER-NETWORK INTERFACE FOR ATM PLESIOCHRONOUS DIGITAL HIERARCHY DATACOM

DATA SHEET
PMC-931011
ISSUE 6
PM7345 S/UNI-PDH
SATURN USER-NETWORK INTERFACE
Transmit:
Receive:
The S/UNI-PDH inserts the calculated BIP-8 by computing even
parity over all transmit bits, including the overhead bits, of the
previous 125µs frame.
The S/UNI-PDH computes the incoming BIP-8 value over one
125µs frame. The result is held and compared to the value
contained in the EM byte of the subsequent frame. Any detected
errors are accumulated.
• TR : Trail Trace
Transmit: The S/UNI-PDH inserts the 16-byte trail access point identifier
programmed into the TTB registers.
Receive: The S/UNI-PDH extracts the repetitive trail access point identifier
and validates it for consistency (i.e., the same pattern is being
received). The S/UNI-PDH also compares the received pattern to
an expected pattern programmed into the TTB registers. This
allows the S/UNI-PDH to verify its continued connection to the
intended transmitter. Note that the S/UNI-PDH does not compute
or check the CRC-7 over the 16-byte trace message.
• MA : Maintenance and Adaptation Byte
Transmit: The S/UNI-PDH inserts the FERF, FEBE, Payload Type bits,
Tributary Unit Multiframe Indicator bits, and the Timing Marker bit
as programmed in the E3 TRAN registers or as indicated by
detection of receive OOF or BIP-8 errors.
Receive: The S/UNI-PDH extracts and reports the FERF bit value when it
has been the same for 3 or 5 consecutive frames. S/UNI-PDH also
extracts and accumulates FEBE occurrences, and extracts the
Payload Type, Tributary Unit Multiframe, and Timing Marker
indicator bits and reports them through microprocessor accessible
registers. The Maintenance and Adaptation byte is also extracted
and output on the ROH.
• NR : Network Operator Byte
Transmit: The S/UNI-PDH inserts the Network Operator byte from the TOH
overhead stream or, optionally, from the XFDL or the TDLSIG
input. When not configured for Tandem Connection Maintenance,
all 8 bits of the Network Operator byte are inserted from TOH or
from XFDL/TDLSIG input. When configured for Tandem
Connection, zeros are inserted into the first four bits of the byte and
the last four bits of the byte are inserted from TOH or from XFDL/
TDLSIG input.
Receive: The S/UNI-PDH extracts the Network Operator byte and outputs it
on ROH or, optionally, terminates it in RFDL or outputs it on
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