PM8610-BIAP PMC [PMC-Sierra, Inc], PM8610-BIAP Datasheet - Page 69
![no-image](/images/no-image-200.jpg)
PM8610-BIAP
Manufacturer Part Number
PM8610-BIAP
Description
SBS Telecom Standard Product Data Sheet Preliminary
Manufacturer
PMC [PMC-Sierra, Inc]
Datasheet
1.PM8610-BIAP.pdf
(338 pages)
- Current page: 69 of 338
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10.1.10
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000168, Issue 3
ROW #
4
5
6
7
8
9
ROW # 1-18
1
2
3
4
5
6
7
VT2 and TU12 virtual tributaries, TVT2s, are transported across the SBI bus in a similar manner
to the E1 tributary mapping. Table 18 shows the transparent structure where “I” is used to
indicate information bytes. There are two options when carrying virtual tributaries on the SBI
bus, the primary difference being how the floating V5 payload is located.
The first option is locked TVT mode, which carries the entire VT2/TU12 virtual tributary
indicated by the shaded region in Table 18. Locked is used to indicate that the location of the
V1,V2 pointer is locked. The virtual tributary must have a valid V1,V2 pointer to locate the V5
payload. In this mode the V5 indicator and payload signals, IV5, OV5, IPL and OPL, are
optionally generated but must be ignored by the receiving device. In locked mode timing is
always sourced by the transmitting side, therefore justification requests are not used and the
JUST_REQ signal is ignored. Other than the V1 and V2 octets which are carrying valid pointers,
all octets can carry data in any format. The location of the V1,V2,V3 and V4 octets is fixed to the
locations shown in Table 18.
The second option is floating TVT mode, which carries the payload comprised of the V5 and I
octets within the shaded region of Table 18. In this mode the V1,V2 pointers are still in a fixed
location and may be valid but are ignored by the receiving device. The V5 indicator and payload
signals, IV5, OV5, IPL and OPL, must be valid and are used to locate the floating payload. The
justification request signal can be used to control the timing on the add bus. The V3 octet is used
to accommodate justification requests. The location of the V1,V2,V3 and V4 octets is fixed to the
locations shown in Table 18.
Table 18 Transparent VT2/TU12 Format
Transparent VT2/TU12 Mapping
COL # E1#1,1 #2,1-
Unuse
d
Unuse
d
Unuse
d
Unuse
d
Unuse
d
Unuse
d
Unuse
d
COL #
1-18
Unused
Unused
Unused
Unused
Unused
Unused
19
V1
I
I
I
I
I
I
VT1.5#1,1 #2,1-3,28 VT1.5#1,1 #2,1-3,28 VT1.5#1,1
19
I
I
I
I
I
I
3 21
20-81
V1
-
-
-
-
-
-
20-102
-
-
-
-
-
-
E1#1,1 #2,1-
82
V5
I
I
I
I
I
I
3 21
83-144 145
-
-
-
-
-
-
-
103
I
I
I
I
I
I
E1#1,1 #2,1-
I
I
I
I
I
I
I
104-186
-
-
-
-
-
-
3 21
146-207 208
-
-
-
-
-
-
-
SBS Telecom Standard Product Data Sheet
187
I
I
I
I
I
I
E1#1,1 #2,1-
I
I
I
I
I
I
I
3 21
209-270
-
-
-
-
-
-
-
#2,1-3,28
188-270
-
-
-
-
-
-
Preliminary
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