Ethernet mapping schemes
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Introduction
Metropolis
®
AMU support the following schemes for the mapping of Ethernet packets
into SDH frames:
•
Link Access Procedure SDH (LAPS encapsulation)
•
Generic Framing Procedure (GFP encapsulation)
•
EoS (Ethernet over SDH) mapping
LAPS encapsulation
LAPS encapsulation is implemented according to ITU-T X.86. It is supported when
using the EPL4_E14, EPL4_E132_75, and ESW4_E14 option cards.
The following rates are supported:
•
Mapping Ethernet packets into Vc12-Xv
•
Mapping Ethernet packets into Vc3-Xv
•
Mapping Ethernet packets into Vc4-Xv
GFP encapsulation
GFP encapsulation is implemented according to T1X1.5/2000-147. It is supported when
using the EPL4_E14, EPL4_E132_75, ESW4_E14, X8PL or X4IP-V2 option cards.
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
•
Mapping of Ethernet MAC frames into Higher Order SDH VC4–Xv
VC12–Xv GFP encapsulation
The Metropolis
®
AMU 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...63 when using the X8PL and X =
1
{
63 per port when using EPL4_E14, EPL4_E132_75, and ESW4_E14 option cards.
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.
Features
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3-24
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See notice on first page
365-312-847R4.0
Issue 4, November 2006