PM5366-PI datasheet(106/267 Pages) PMC

106 / 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

In each case, the E3 transmitter drives the selected E3 clock source onto the

TCLK output pins of the DS3/E3 line side interface.

9.21 E3 Trail Trace Buffer

The Trail Trace Buffer (TTB) extracts and sources the trail trace message carried

in the TR byte of the G.832 E3 stream. The message is used by the OS

(operating system) to prevent delivery of traffic from the wrong source and is 16

bytes in length. The 16-byte message is framed by the PTI Multiframe Alignment

Signal (TMFAS = 'b10000000 00000000). One bit of the TMFAS is placed in the

most significant bit of each message byte. In the receive direction, the extracted

message is stored in the internal RAM for review by an external microprocessor.

By default, the byte of a 16-byte message with its most significant bit set high will

be written to the first location in the RAM. The extracted trail trace message is

checked for consistency between consecutive multiframes. A message received

unchanged three or five times (programmable) is accepted for comparison with

the copy previously written into the internal RAM by the external microprocessor.

Alarms are raised to indicate reception of unstable and mismatched messages.

In the transmit direction, the trail trace message is sourced from the internal

RAM for insertion into the TR byte by the E3-TRAN.

The Payload Type label carried in the MA byte of the G.832 E3 stream is also

extracted. The label is used to ensure that the adaptation function at the trail

termination sink is compatible with the adaptation function at the trail termination

source. The Payload Type label is check for consistency between consecutive

multiframes. A Payload Type label received unchanged for five frames is

accepted for comparison with the copy previously written into the TTB by the

external microprocessor. Alarms are raised to indicate reception of unstable and

mismatched Payload Type label bits.

9.22 Tributary Payload Processor (VTPP)

Each of of three tributary payload processors (VTPP) processes the virtual

tributaries within an STS-1, AU3, or TUG3. The VTPP can be configured to

process either VT1.5s or VT2s within an STS-1 or either TU11s or TU12s within

an AU3 or TUG3. The number of tributaries managed by each VTPP ranges

from 21 (when configured to process all VT2s or equivalently all TU12s) to 28

(when configured to process all VT1.5s or equivalently all TU11s).

The Tributary payload processor is used in both the ingress and egress data

paths. In the egress direction the pointer interpreter section of the VTPP can be

bypassed on a per tributary basis to allow for pointer generator in the absence of

valid pointers which is necessary when mapping floating transparent virtual

tributaries from the SBI bus.

PM5366-PI Datasheet(PDF) 106 Page - PMC-Sierra, Inc

PM5366-PI Datasheet(HTML) 106 Page - PMC-Sierra, Inc

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