PM7346 Datasheet, PDF (327/419 Pages) PMC-Sierra, Inc – SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

DATASHEET
PMC-960835
ISSUE 6
PM7346 S/UNI-QJET
SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3
Overhead Field
Alignment
Pattern
PO-P11:
Path Overhead
Identifier
Z1-Z6:
Growth:
F1:
User Channel
B1:
Bit Interleaved
Parity
Transmit Operation
Inserts the path overhead
identifier codes in accordance
with the PLCP frame
alignment. See Table 30.
These octets are unused and
are nominally programmed
with all zeros. Access to
these octets is provided by
the PLCP transmit overhead
access port.
This octet is unused and the
value inserted in this octet is
controlled by an internal
register or by TPOH pin.
This octet contains an 8-bit
interleaved parity (BIP)
calculated across the entire
PLCP frame (excluding the
A1, A, Pn octets and the
trailer). The B1 value is
calculated based on even
parity and the value inserted
in the current frame is the BIP
Receive Operation
When the pattern has been
detected for two consecutive rows,
along with two valid, and
sequential path overhead identifier
octets, the S/UNI-QJET declares
in-frame. Note that the ATM cell
boundaries are implicitly known
when the PLCP frame is located,
thus cell delineation is
accomplished by locating the
PLCP frame. When errors are
detected in both octets in a single
row, or when errors are detected in
two consecutive path overhead
identifier octets, the S/UNI-QJET
declares an out-of-frame defect.
The loss-of-frame defect is an
integrated version of the out-of-
frame defect state.
Identifies the PLCP path overhead
bytes by monitoring the sequence
of the POI bytes.
These octets are ignored and are
extracted on the RPOH pin.
This octet is ignored and is
extracted on the RPOH pin.
The bit interleaved parity is
calculated for the current frame
and stored. The B1 octet
contained in the subsequent frame
is extracted and compared against
the calculated value. Differences
between the two values provide an
indication of the end-to-end bit
error rate. These differences are
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