Alcatel-Lucent 1643 AMS Applications And Planning Manual page 183

Ethernet Overview
The following GFP encapsulation are possible:
• Mapping of Ethernet MAC frames into Lower Order SDH VC12–Xv
• Mapping of Ethernet MAC frames into Lower Order SDH VC3–Xv
VC12–Xv GFP encapsulation
The 1643 AM supports virtual concatenation of Lower Order SDH VC-12 as inverse
multiplexing technique to size the bandwidth of a single internal WAN port for
transport of encapsulated Ethernet and Fast Ethernet packets over the SDH/SONET
network. This is noted VC12-Xv, where X = 1...5. Usage is in conformance with
ITU-T G.707 Clause 11 (2000 Edition) and G.783 Clause 12.5 (2000).
This feature implies specific processing of some overhead bytes:
• Source direction: Each individual VC-12 (from the VC12-Xv group) K4-byte (bit
1-2 multiframed) will be written to indicate the values of the multiframe indicator
(timestamping), as well as the sequence indicator (individual VC-12 position inside
a VC12-Xv)
• Sink direction: Each individual VC-12 (from the VC12-Xv group) K4-byte (bit 1-2
multiframed) multi-framing indicator and sequence indicator is used to check that
the differential delay between the individual VC-12s of the VC12-Xv remains
within implementation limits.
Additionally, the use of G.707 Extended Signal Label is supported using V5(bits 5-7)
field, in which the "101" value is written, which points to the appropriate bits of
K4(bit 1) multiframe for writing in the Extended Signal Label value.
VC3–Xv GFP encapsulation
The 1643 AM supports virtual concatenation of Lower Order SDH VC-3 as inverse
multiplexing technique to size the bandwidth of a single internal WAN port for
transport of encapsulated Ethernet and Fast Ethernet packets over the SDH/SONET
network. This is noted VC3–Xv, where X = 1,2 (SDH). Usage is in conformance with
ITU-T G.707 Clause 11 (2000 Edition) and G.783 Clause 12.5 (2000) and T1X1
T1.105 Clause 7.3.2 (2001 Edition).
This feature implies specific processing of some overhead bytes:
• Source direction; each individual VC-3 (from the VC3–Xv group) H4-byte will be
written to indicate the values of the two-stage- multiframe indicator (timestamping),
as well as the sequence indicator (individual VC-3 position inside a VC3–Xv)
• Sink direction; each individual VC-3 (from the VC3–Xv group) H4-byte
two-stage-multi-framing indicator and sequence indicator is used to check that the
differential delay between the individual VC-3 of the VC3–Xv remains within
implementation limits.
Virtual concatenation
The virtual concatenation function arranges the Ethernet frames into the right SDH
virtual container. It is possible to map the client's data signal over a number of
grouped virtual containers.
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365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
Ethernet over SDH
11-7