PM4332 datasheet(61/446 Pages) PMC

61 / 446 page

PRELIMINARY

PM4332 TE-32

DATA SHEET

PMC-2011402

ISSUE 1

HIGH DENSITY 32 CHANNEL T1/E1/J1 FRAMER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR THE INTERNAL USE OF ITS CUSTOMERS

for CAS multiframe alignment pattern errors. The E1 framer also detects and

indicates loss of basic frame, loss of CRC multiframe, and loss of CAS

multiframe, based on user-selectable criteria. The reframe operation can be

initiated by software, by excessive CRC errors, or when CRC multiframe

alignment is not found within 400 ms.

The E1 framer extracts the contents of the International bits (from both the FAS

frames and the NFAS frames), the National bits, and the Extra bits (from timeslot

16 of frame 0 of the CAS multiframe). Moreover, the framer also extracts

submultiframe-aligned 4-bit codewords from each of the National bit positions

Sa4 to Sa8, and stores them in microprocessor-accessible registers that are

updated every CRC submultiframe.

The E1 framer identifies the raw bit values for the Remote (or distant frame)

Alarm (bit 3 in timeslot 0 of NFAS frames) and the Remote Signaling Multiframe

(or distant multiframe) Alarm (bit 6 of timeslot 16 of frame 0 of the CAS

multiframe). Access is also provided to the "debounced" remote alarm and

remote signaling multiframe alarm bits which are set when the corresponding

signals have been a logic 1 for 4 (provided the RAIC bit is logic 1) and 3

consecutive occurrences, respectively, as per Recommendation O.162.

Detection of AIS and timeslot 16 AIS are provided. AIS is also integrated, and an

AIS Alarm is indicated if the AIS condition has persisted for at least 100 ms. The

out of frame (OOF=1) condition is also integrated, indicating a Red Alarm if the

OOF condition has persisted for at least 100 ms.

An interrupt may be generated to signal a change in the state of any status bits

(INF, INSMF, INCMF, AIS or RED), and to signal when any event (RAI, RMAI,

AISD, TS16AISD, COFA, FER, SMFER, CMFER, CRCE or FEBE) has occurred.

Additionally, interrupts may be generated every frame, CRC submultiframe, CRC

multiframe or signaling multiframe.

Basic Frame Alignment Procedure

The E1 framer searches for basic frame alignment using the algorithm defined in

ITU-T Recommendation G.706 sections 4.1.2 and 4.2.

PM4332 Datasheet(PDF) 61 Page - PMC-Sierra, Inc