Alcatel-Lucent 1643 AMS Applications And Planning Manual page 200

Ethernet Overview
VLAN
, 5 91
Each access node is individually connected to the hub node over a single SDH
connection (or even one SDH connection per LAN port). The trunking LAN interface
is a network-role LAN port. The VLAN tags in the Ethernet frames are preserved, i.e.
made available to the service provider, and can thus be used for further processing.
A high WAN port density is required in the hub-node.
Averaging of the peak traffic loads of each access node (or LAN port) is not used.
Each SDH link bandwidth has to be engineered for the corresponding amount of peak
traffic.
Distributed aggregation in the access network
This figure shows an example of distributed aggregation in the access network:
....................................................................................................................................................................................................................................
11-24
VLAN , 5 17 18 19 , , ,
21 22 , , 66 91 ,
Hub node
Access
nodes
LAN
VLAN
21 22 ,
LAN
Alcatel-Lucent - Proprietary
Internet
X
ISP router
Trunking LAN interface
(network-role LAN port)
SDH
network
VLAN
66
LAN
See notice on first page
Ethernet over SDH applications
Access
nodes
VLAN
17 18 19 , ,
LAN
365-312-801R7.2
Issue 3, May 2007