PM4328 datasheet(71/250 Pages) PMC

71 / 250 page

STANDARD PRODUCT

PM4328 TECT3

DATASHEET

PMC-2011596

ISSUE 1

HIGH DENSITY T1/E1 FRAMER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

multiframe alignment signals are observed within 8 ms, with the time separating

two alignment signals being a multiple of 2 ms

Once CRC multiframe alignment is found, the OOCMFV register bit is set to

logic 0, and the E1-FRMR monitors the multiframe alignment signal, indicating

errors occurring in the 6-bit MFAS pattern, errors occurring in the received CRC

and the value of the FEBE bits (bit 1 of frames 13 and 15 of the multiframe).

The E1-FRMR declares loss of CRC multiframe alignment if basic frame

alignment is lost. However, once CRC multiframe alignment is found, it cannot

be lost due to errors in the 6-bit MFAS pattern.

Under the CRC-to-non-CRC interworking algorithm, if the E1-FRMR can achieve

basic frame alignment with respect to the incoming PCM data stream, but is

unable to achieve CRC-4 multiframe alignment within the subsequent 400 ms,

the distant end is assumed to be a non CRC-4 interface. The details of this

algorithm are illustrated in the state diagram in Figure 7.

PM4328 Datasheet(PDF) 71 Page - PMC-Sierra, Inc