PM5366-PI datasheet(77/267 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

The time required to acquire frame alignment to an error-free ingress stream,

containing randomly distributed channel data (i.e. each bit in the channel data

has a 50% probability of being 1 or 0), is dependent upon the framing format.

For SF format, the T1 framer will determine frame alignment within 4.4ms 99

times out of 100. For SLC®96 format, the T1 framer will determine frame

alignment within 13ms. For ESF format, the T1 framer will determine frame

alignment within 15 ms 99 times out of 100.

Once the T1 framer has found frame, the ingress data is continuously monitored

for framing bit errors, bit error events (a framing bit error in SF or a CRC-6 error

in ESF), and severely errored framing events. The performance data is

accumulated for each tributary. The T1 framer also detects out-of-frame, based

on a selectable ratio of framing bit errors.

9.3.1 Inband Code Detection

The framer detects the presence of either of two programmable inband loopback

activate and deactivate code sequences in either framed or unframed data

streams (whether data stream is framed or unframed is not programmable) .

The loopback codes will be detected in the presence of a mean bit error rate of

up to 10-2. When the inband code is framed, the framing bits overwrite the code

bits, thus appearing to the receiver as a 2.6x10-3 BER (which is within the

tolerable BER of 10-2).

Code indication is provided on the active high loopback activate (LBA) and

loopback deactivate (LBD) status bits. Changes in these status bits result in the

setting of corresponding interrupt status bits, LBAI and LBDI respectively, and

can also be configured to result in the setting of a maskable interrupt indication.

The inband loopback activate condition consists of a repetition of the

programmed activate code sequence in all bit positions for a minimum of 5.08

seconds (± 40 ms). The inband loopback deactivate condition consists of a

repetition of the programmed deactivate code sequence in all bit positions for a

minimum of 5.08 seconds (± 40 ms). Programmed codes can be from three to

eight bits in length.

The code sequence detection and timing is compatible with the specifications

defined in T1.403, TR-TSY-000312, and TR-TSY-000303.

9.3.2 T1 Bit Oriented Code Detection

The presence of 63 of the possible 64 bit oriented codes transmitted in the T1

Facility Data Link channel in ESF framing format is detected, as defined in ANSI

PM5366-PI Datasheet(PDF) 77 Page - PMC-Sierra, Inc

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