PM5366-PI datasheet(100/267 Pages) PMC

100 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

COFA. Error events continue to be indicated even when the FRMR is indicating

OOF, based on the previous frame alignment.

The RED alarm and alarm indication signal are detected by the DS2 FRMR in

9.9 ms for DS2 format. The framer employs a simple integration algorithm (with

a 1:1 slope) that is based on the occurrence of "valid" DS2 M-frame intervals.

For the RED alarm, a DS2 M-frame is said to be a "valid" interval if it contains a

RED defect, defined as the occurrence of an OOF event during that M-frame.

For AIS, a DS2 M-frame is said to be a "valid" interval if it contains AIS, defined

as the occurrence of less than 9 zeros while the framer is out of frame during

that M-frame. The discrepancy threshold ensures the detection algorithm

operates in the presence of bit error rates of up to 10-3. Each "valid" DS2 M-

frame causes an integration counter to increment; "non-valid" DS2 M-frame

intervals cause a decrement. RED or AIS is declared if the associated integrator

count saturates at 53, resulting in a detection time of 9.9 ms. RED or AIS

declaration is deasserted when the associated count decrements to 0.

The DS2 X-bit is extracted by the DS2 FRMR to provide an indication of far end

receive failure. The FERF status is set to the current X/RAI state only if the two

successive X/RAI bits were in the same state. The extracted FERF status is

buffered for 6 DS2 M-frames before being reported within the DS2 FRMR Status

status in a valid state during an out of frame occurrence. When an OOF occurs,

the FERF value is held at the state contained in the last buffer location

corresponding to the previous sixth M-frame. This location is not updated until

the OOF condition is deasserted. Meanwhile, the last four of the remaining five

buffer locations are loaded with the frozen FERF state while the first buffer

location corresponding to the current M-frame is continually updated every M-

frame based on the above FERF definition. Once correct frame alignment has

been found and OOF is deasserted, the first buffer location will contain a valid

FERF status and the remaining five buffer locations are enabled to be updated

every M-frame.

DS2 M-bit and F-bit framing errors are indicated. These error indications are

accumulated for performance monitoring purposes in internal, microprocessor

readable counters. The performance monitoring accumulators continue to count

error indications even while the framer is indicating OOF.

The DS2 FRMR may be configured to generate interrupts on error events or

status changes. All sources of interrupts can be masked or acknowledged via

internal registers. Internal registers are also used to configure the DS2 FRMR.

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