PM5366-PI datasheet(83/267 Pages) PMC

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PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

Table 1

- E1 framer Framing States

State

Out of Frame

Out of Offline Frame

FAS_Find_1

Yes

NFAS_Find

Yes

FAS_Find_2

Yes

BFA

CRC to CRC Interworking

FAS_Find_1_Par

Yes

NFAS_Find_Par

Yes

FAS_Find_2_Par

Yes

BFA_Par

CRC to non-CRC Interworking

The states of the primary basic framer and the parallel/offline framer in the E1

framer block at each stage of the CRC multiframe alignment algorithm are shown

in Table 1.

From an out of frame state, the E1 framer attempts to find basic frame alignment

in accordance with the FAS/NFAS/FAS G.706 Basic Frame Alignment procedure

outlined above. Upon achieving basic frame alignment, a 400 ms timer is

started, as well as an 8 ms timer. If two CRC multiframe alignment signals

separated by a multiple of 2 ms are observed before the 8 ms timer has expired,

CRC multiframe alignment is declared.

If the 8 ms timer expires without achieving multiframe alignment, a new offline

search for basic frame alignment is initiated. This search is performed in

accordance with the Basic Frame Alignment procedure outlined above.

However, this search does not immediately change the actual basic frame

alignment of the system (i.e., PCM data continues to be processed in

accordance with the first basic frame alignment found after an out of frame state

while this frame alignment search occurs as a parallel operation).

When a new basic frame alignment is found by this offline search, the 8 ms timer

is restarted. If two CRC multiframe alignment signals separated by a multiple of

2 ms are observed before the 8 ms timer has expired, CRC multiframe alignment

is declared and the basic frame alignment is set accordingly (i.e., the basic frame

alignment is set to correspond to the frame alignment found by the parallel offline

search, which is also the basic frame alignment corresponding to the newly

found CRC multiframe alignment).

Subsequent expirations of the 8 ms timer will likewise reinitiate a new search for

basic frame alignment. If, however, the 400 ms timer expires at any time during

this procedure, the E1 framer stops searching for CRC multiframe alignment and

declares CRC-to-non-CRC interworking. In this mode, the E1 framer may be

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