PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 43

• Manufacturer Part Number: PM8611-BIAP
• Manufacturer: PMC [PMC-Sierra, Inc]

10.1.6
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
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E1 Tributary Mapping
Table 10 shows the format for mapping 63 E1s within the SPE octets. The timeslots and framing
bits within each E1 are easily located within this mapping for channelized E1 applications. It is
acceptable for the framing bits to not carry valid framing information on the Add Bus since the
physical layer device will provide this information. Unframed E1s use the exact same format for
mapping 63 E1s into the SBI except that the E1 tributaries need not align with the timeslot
locations associated with channelized E1 applications. The V1,V2 and V4 octets are not used to
carry E1 data and are either reserved used for control information across the interface. When
enabled, the V4 octet carries clock phase information across the SBI. 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 an E1 data octet but
only during rate adjustments as indicated by the V5 indicator signals, IV5 and OV5, and payload
signals, IPL and OPL. The PP octets carry channel associated signaling phase information and E1
frame alignment. TS#0 through TS#31 make up the E1 channel.
The V1,V2,V3 and V4 octets are fixed to the locations shown. All the other octets, shown shaded
for E1#1,1, float within the allocated columns maintaining the same order and moving a
maximum of one octet per 2 KHz multi-frame. The position of the floating E1 is identified via
the V5 Indicator signals, IV5 and OV5, which locate the V5 octet. When the E1 tributary rate is
faster than the E1 tributary nominal rate, the E1 tributary is shifted ahead by one octet which is
compensated by sending an extra octet in the V3 location. When the E1 tributary rate is slower
than the nominal rate the E1 tributary is shifted by one octet which is compensated by inserting a
stuff octet in the octet immediately following the V3 octet and delaying the octet that was
originally in that position.
Table 10 E1 Framing Format
COL #
1-18
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
E1#1,1
19
V1
TS#1
TS#5
TS#9
TS#13
TS#17
TS#21
TS#25
TS#29
V2
TS#1
TS#5
TS#9
TS#13
TS#17
#2,1-3,21 E1#1,1
20-81
V1
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-
-
-
-
-
-
-
V2
-
-
-
-
-
82
V5
TS#2
TS#6
TS#10
TS#14
TS#18
TS#22
TS#26
TS#30
R
TS#2
TS#6
TS#10
TS#14
TS#18
#2,1-3,21 E1#1,1
83-144
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SBSLITE™ Telecom Standard Product Data Sheet
145
PP
TS#3
TS#7
TS#11
TS#15
TS#19
TS#23
TS#27
TS#31
PP
TS#3
TS#7
TS#11
TS#15
TS#19
#2,1-3,21 E1#1,1
146-207 208
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TS#0
TS#4
TS#8
TS#12
TS#16
TS#20
TS#24
TS#28
R
TS#0
TS#4
TS#8
TS#12
TS#16
TS#20
Preliminary
#2,1-3,21
209-270
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