PM4388 datasheet(45/284 Pages) PMC

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PM4388 TOCTL

DATA SHEET

PMC-960840

ISSUE 5

OCTAL T1 FRAMER

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

9.14

Transmit Per-DS0 Serial Controller (TPSC)

The Transmit Per-DS0 Serial Controller allows data and signaling trunk

conditioning or idle code to be applied on the transmit DS-1 stream on a per-DS0

basis. It also allows per-DS0 control of zero code suppression, data inversion,

DS0 loopback (from the ingress stream), channel insertion, and the detection or

generation of pseudo-random or repetitive patterns.

The TPSC interfaces directly to the XBAS block and provides serial streams for

signaling control, idle code data and egress data control.

9.15

Signaling Aligner (SIGA)

When enabled, the Signaling Aligner is positioned in the egress path between

the egress interface and XBAS. Its purpose is to ensure that, if the signaling on

ESIG[x] is changed in the middle of a superframe, the XBAS completes

transmitting the A,B,C, and D bits for the current superframe before switching to

the new values. This permits signaling integrity to be preserved independent of

the superframe alignment of the XBAS or the signaling data source.

9.16

Inband Loopback Code Generator (XIBC)

The Inband Loopback Code Generator function is provided by the XIBC block.

This block generates a stream of inband loopback codes (IBC) to be inserted into

a T1 data stream. The IBC stream consists of continuous repetitions of a specific

code and can be either framed or unframed. When the XIBC is enabled to

generate framed IBC, the framing bit overwrites the inband code pattern. The

contents of the code and its length are programmable from 3 to 8 bits.

9.17

Bit Oriented Code Generator (XBOC)

The Bit Oriented Code Generator function is provided by the XBOC block. This

block transmits 63 of the possible 64 bit oriented codes in the Facility Data Link

channel in ESF framing format, as defined in ANSI T1.403-1989. The 64th code

(111111) is similar to the HDLC Flag sequence and is used in the XBOC to

disable transmission of any bit oriented codes.

Bit oriented codes are transmitted on the Facility Data Link channel as a 16-bit

sequence consisting of 8 ones, a zero, 6 code bits, and a trailing zero

(111111110xxxxxx0) which is repeated as long as the code is not 111111. The

transmitted bit oriented codes have priority over any data transmitted on the FDL

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