PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 103

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
• the General Purpose Communication Channel byte for processing by the HDLC
• the Remote Alarm Indication bit (bit 11 of the frame) and indicates a Remote
• the National Use reserved bit (bit 12 of the frame) for further processing in the
receiver when the RNETOP bit in the E3 Data Link Control register is logic 0.
In G.751 E3 mode, the E3-FRMR extracts:
Alarm when the RAI bit is a logic 1 for 3 or 5 consecutive frames. Similarly, the
Remote Alarm is removed when the RAI bit is logic 0 for 3 or 5 consecutive
frames;
HDLC receiver when the RNETOP bit in the E3 Data Link Control register is logic
0. Optionally, an interrupt can be generated when the National Use bit changes
state.
The E3-FRMR declares out of frame alignment if the framing pattern is in error
for four consecutive frames. The E3-FRMR is an "off-line" framer, where all
frame alignment indications, all overhead bit indications, and all overhead bit
processing continue based on the previous alignment. Once the framer has
determined the new frame alignment, the out-of-frame indication is removed and
a COFA indication is declared if the new alignment differs from the previous
alignment.
The E3-FRMR detects the presence of AIS in the incoming data stream when
less than 8 zeros in a frame are detected while the framer is OOF in G.832
mode, or when less than 5 zeros in a frame are detected while OOF in G.751
mode. This algorithm provides a probability of detecting AIS within a single
frame in the presence of a 10
After five frames, the probability of detection rises to >99.999% for both formats.
Loss of signal is LOS is declared when no marks have been received for 32
consecutive bit periods. Loss of signal is de-asserted after 32 bit periods during
which there is no sequence of four consecutive zeros.
E3 Loss of Frame detection is provided as recommended by ITU-T G.783 with
programmable integration periods of 1ms, 2ms, or 3ms. While integrating up to
assert LOF, the counter will integrate up when the framer asserts an Out of
Frame condition and integrates down when the framer de-asserts the Out of
Frame condition. Once an LOF is asserted, the framer must not assert OOF for
the entire integration period before LOF is de-asserted.
The E3-FRMR can also be enabled to automatically assert the RAI/FERF
indication in the outgoing transmit stream upon detection of any combination of
ISSUE 1
-3
BER as 92.9% in G.832 and 98.0% in G.751.
91
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84