Alcatel-Lucent 1643 AMS Applications And Planning Manual page 218

Ethernet Overview
Ethernet mapping schemes
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Introduction
1643 AM and 1643 AMS support the following schemes for the mapping of Ethernet
packets into SDH frames:
• Link Access Procedure SDH (LAPS encapsulation)
• Ethernet over SDH (EoS encapsulation)
• Generic Framing Procedure (GFP encapsulation)
LAPS encapsulation
LAPS encapsulation is implemented according to ITU-T X.86. It is supported when
using the option card X8PL.
EoS encapsulation
EoS encapsulation is implemented according to T1X1.5/99-268. It is supported when
using the option card X4IP.
GFP encapsulation
GFP encapsulation is implemented according to T1X1.5/2000-147. It is supported when
using the option cards X8PL or X4IP.
GFP provides a generic mechanism to adapt traffic from higher-layer client signals
over a transport network.
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
TUG structure
For X8PL, it is possible to set the TUG structure of the VC4 that runs to the option
board. The TUG structure determines what VC12s/VC3s are available for assignment
to a VCG. The method of setting the bandwidth of a VCG has also been modified. For
X8PL it is not possible to modify the bandwidth parameter of a VCG. Instead
VC12s/VC3 have to be allocated to a certain VCG, the total combined bandwidth of
the allocated VCs is reflected in the bandwidth parameter of the VCG.
The TUG structure of the VC4 running to the option board also determines the
possible cross-connections to the X8PL unit.
VC12–Xv GFP encapsulation
The 1643 AM and 1643 AMS support 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 when using the X4IP
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Issue 3, May 2007