STANDARD PRODUCT
PM5365 TEMAP
DATASHEET
PMC-1991148
ISSUE 3
HIGH DENSITY VT/TU MAPPER
AND M13 MULTIPLEXER
Table 22: DS3 Clock Rate Encoding
ClkRate[1:0]
DS3 Clocks / 2KHz
“00” – Nominal
“01” – Fast
“1x” – Slow
22368
22372
22364
SBI Alarms
The TEMAP transfers alarm conditions across the SBI bus for T1 and E1
tributaries. The TEMAP does not support alarm conditions across the SBI bus for
DS3 nor transparent VTs.
Table 19 show the alarm indication bit, ALM, as bit 7 of the Link Rate Octet.
Devices connecting to the TEMAP 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. 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 can be
configured to use the alarm bit to force AIS on a per link basis.
T1 Tributary Mapping
Table 23 shows the format for mapping 84 T1s within the SPE octets. Clear
channel bits within each T1 are easily located within this mapping. 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
Tables 1 and 3. 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
the SBI bus. The V5 and R octets do not carry any information and are fixed to a
zero value. The V3 octet carries a T1 data octet but only during rate adjustments
as indicated by the V5 indicator signals, DV5 and AV5, and payload signals,
SDPL and SAPL.
The V1, V2, V3 and V4 octets are fixed to the locations shown. All the other
octets, shown shaded for T1#1,1, float within the allocated columns maintaining
the same order and moving a maximum of one octet per 2KHz multi-frame. The
position of the floating T1 is identified via the V5 Indicator signals, SDV5 and
SAV5, which locate the V5 octet. When the T1 tributary rate is faster than the
SBI nominal T1 tributary rate, the T1 tributary is shifted ahead by one octet which
is compensated by sending an extra octet in the V3 location. When the T1
tributary rate is slower than the nominal SBI tributary rate the T1 tributary is
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167
PMC [ PMC-SIERRA, INC ]
