only needs to be supported at the end nodes (i.e. at the TransLAN
®
cards that interface
with the end-customer’s LAN). The rest of the network simply transports the separate
channels.
Example 1
As an example, the following figure shows the virtual concatenation of 5 × VC-12:
The 10 Mbit/s payload is put into a VC-12–5v, i.e. into a virtual concatenation group
(VCG) consisting of five virtually concatenated VC-12s. These VC-12s can travel the
network independently, and do not have to follow the same route. At the endpoint, the
VC-12–5v is reassembled, and the payload is extracted.
Example 2
The second example shows the principle of virtual concatenation in a Gigabit Ethernet
(GbE) network application. Protection of the virtually concatenated payload is possible
via standard SDH transmission protection schemes.
VC-12-5v
10 Mbit/s
Ethernet payload
VC-12 VC-12 VC-12VC-12VC-12
VC-12 VC-12 VC-12VC-12VC-12
VC-12-5v
10 Mbit/s
Ethernet payload
0 1 2 3 4
0 1 2 3 4
LAN LANWAN WAN
Network element Network element
Ethernet
frame
Ethernet
frame
VC-4-7v VC-4-7v
Traffic provisioning
Virtual concatenation
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-41
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