PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 48

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

10.1.9
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Table 16 E3 Frame Stuffing Format
E3 asynchronous timing is compensated via the H3 octet as described in section 10.1.2. E3 link
rate adjustments are optionally passed across the SBI via the Linkrate octet as described in
section 10.1.3. E3 alarm conditions are optionally passed across the SBI bus via the Linkrate octet
as described in Sections 10.1.3 and 10.1.4.
Transparent VT1.5/TU11 Mapping
VT1.5 and TU11 virtual tributaries, TVT1.5s, are transported across the SBI bus in a similar
manner to the T1 tributary mapping. Table 17 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 VT1.5/TU11 virtual tributary
indicated by the shaded region in Table 17. 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, may be
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 must carry 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 17.
The second option is floating TVT mode which carries the payload comprised of the V5 and I
octets within the shaded region of Table 17. 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 octets are
used to accommodate justification requests. The location of the V1,V2,V3 and V4 octets is fixed
to the locations shown in Table 17.
V5
V5
6*R
5*R
5*R
5*R
5*R
5*R
5*R
5*R
FAS
FAS
FAS
FAS
FAS
FAS
FAS
FAS
11*D
11*D
11*D
11*D
11*D
11*D
11*D
11*D
5*R
5*R
5*R
5*R
5*R
5*R
5*R
5*R
12*D
12*D
12*D
12*D
12*D
12*D
12*D
12*D
5*R
5*R
5*R
5*R
5*R
5*R
5*R
5*R
12*D
12*D
12*D
12*D
12*D
12*D
12*D
12*D
SBSLITE™ Telecom Standard Product Data Sheet
5*R
5*R
5*R
5*R
5*R
5*R
5*R
5*R
12*D
12*D
12*D
12*D
12*D
12*D
12*D
12*D
Preliminary
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