STANDARD PRODUCT
PM5365 TEMAP
DATASHEET
PMC-1991148
ISSUE 3
HIGH DENSITY VT/TU MAPPER
AND M13 MULTIPLEXER
SREFCLK
S S S
T1/E1 CLK
S S S
ꢀ
Clock Count
ꢁ
ꢀ Phase
ꢁ
Link Rate Octet
T1/E1 Format
Bit #
7
ALM
6
0
5:4
ClkRate[1:0]
3:0
Phase[3:0]
Table 20: SBI T1/E1 Clock Rate Encoding
ClkRate[1:0]
T1 Clocks / 2KHz E1 Clocks / 2 KHz
“00” – Nominal
“01” – Fast
“1x” – Slow
772
773
771
1024
1025
1023
The method for transferring DS3 link rate information across the SBI passes the
encoded count of DS3 clocks between 2KHz SC1FP pulses in the same method
used for T1/E1 tributaries, but does not pass any phase information. The other
difference from T1/E1link rate is that ClkRate[1:0] indicates whether the nominal
number of clocks are generated or if four fewer or four extra clocks are
generated during the SC1FP period. The format of the DS3 link rate octet is
shown in Table 21. This is passed across the SBI via the Linkrate octet which
follows the H3 octet in the column, see Table 25. Table 22 shows the encoding of
the clock count, ClkRate[1:0], passed in the link rate octet.
Table 21: DS3 Link Rate Information
Link Rate Octet
DS3 Format
Bit #
7
0
6
0
5:4
ClkRate[1:0]
3:0
Unused
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166
PMC [ PMC-SIERRA, INC ]
