PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 204

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
Transparent VT2/TU12 Mapping
VT2 and TU12 virtual tributaries, TVT2s, are transported across the SBI bus in a
similar manner to the E1 tributary mapping. The TEMAP-84 supports both TVT
modes simultaneously in the SBI DROP bus and is configurable on a per
tributary basis in the SBI ADD bus.
Table 37 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 37. The term 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, SDV5, SAV5, SDPL and SAPL, 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 SAJUST_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
37.
The second option is floating TVT mode which carries the payload comprised of
the V5 and I octets within the shaded region of Table 37. 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, SDV5, SAV5, SDPL and
SAPL, must be valid and are used to locate the floating payload. The justification
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
V4
I
I
I
I
I
I
I
I
I
I
I
I
I
ISSUE 1
V4
-
-
-
-
-
-
-
-
-
-
-
-
-
192
I
I
I
I
I
I
I
I
I
I
I
I
I
I
-
-
-
-
-
-
-
-
-
-
-
-
-
-
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
I
I
I
I
I
I
I
I
I
I
I
I
I
I
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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-
-
-
-
-
-
-
-
-
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