Zyxel IES-5106 [42/1156] Adm adm ima 2 ima 1

Zyxel IES-5106 [42/1156] Adm adm ima 2 ima 1
Chapter 1 Getting to Know Your MSC
Management Switch Card User’s Guide
42
Figure 3 IMA Application
Remote Site Traffic Flow Scenario
In remote sites, traffic coming from subscribers through a DSL line card is sent to the MSC
management card and then forwarded to the specified IMA card in your configuration. One DSL line
card can only map to one IMA card. One IMA card can handle traffic sent from multiple DSL line
cards.
Figure 4 IMA Application in Remote Sites
Normally, traffic coming from subscribers is untagged or has one VLAN tag. The receiving xDSL line
card adds an inner VLAN tag (C-tag) or add both inner (C-tag) and outer VLAN tag (S-tag) into
untagged frames. The MSC receives the frames, then forwards the frames to the specified IMA
card. The IMA card converts the frames into ATM cells and assigns them to a corresponding channel
(PVC) based on their VLAN tags.
The return traffic is handled in a similar way. The IMA converts ATM cells into Ethernet frames and
adds VLAN tags according to your DTPVC or PVC settings. The MSC forwards the frames to the
corresponding xDSL line cards. The xDSL removes the VLAN tag and forwards the frames to
subscribers.
ADM
ADM
IMA-2
IMA-1
Remote
Site
CO Site
TDM
one E1 line
xDSL
CPE

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