PM5366 datasheet(193/267 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

181

Table 25

- DS3 Link Rate Information

Link Rate Octet

Bit #

5:4

3:0

DS3 Format

ALM

0 ClkRate[1:0]

Unused

Table 26

- DS3 Clock Rate Encoding

ClkRate[1:0]

DS3 Clocks / 2KHz

“00” – Nominal

22368

“01” – Fast

22372

“1x” – Slow

22364

SBI Alarms

The TEMAP-84 transfers alarm conditions across the SBI for T1, E1 and DS3

tributaries but not valid for transparent VTs.

Table 23 and Table 25 show the alarm indication bit, ALM, as bit 7 of the Link

Rate Octet. Devices connecting to the TEMAP-84 which do not support alarm

indications must set this bit to 0 on the SBI ADD bus.

The presence of an alarm condition is indicated by the ALM bit set high in the

Link Rate Octet. For T1 and E1 tributaries, either an out-of-frame condition or

Red alarm (persistent out-of-frame) may set the ALM as determined by the

IREDEN and IOOFEN per-tributary configuration bits. The absence of an alarm

condition is indicated by the ALM bit set low in the Link Rate Octet. In the egress

direction the TEMAP-84 can be configured to use the alarm bit to force AIS on a

per link basis by the EALMEN or EGRALMEN register bits.

T1 Tributary Mapping

Table 27 shows the format for mapping 84 T1s within the SPE octets. The DS0s

and framing bits within each T1 are easily located within this mapping for

SONET/SDH byte synchronously mapped T1 applications. Unframed T1s use

the exact same format for mapping 84 T1s into the SBI except that the T1

tributaries need not align with the frame bit and DS0 locations. The V1,V2 and

V4 octets are not used to carry T1 data and are either reserved or used for

control across the interface. When enabled, the V4 octet is the Link Rate octet

of Table 23. It carries alarm and clock phase information across the SBI bus.

The V1 and V2 octets are unused and should be ignored by devices listening to

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