Ethernet mapping schemes

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 option card and X = 1...63 when using the X8PL option card.. Usage is in conformance with ITU-T G.707 Clause 11 (2000 Edition) and G.783 Clause 12.5 (2000).

Additionally, the use of G.707 Extended Signal Label is supported using V5 (bits 5-7) field.

VC3–Xv GFP encapsulation

The 1643 AM and 1643 AMS support 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). For X8PL also VC3-3v is supported. 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).

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