Ima Screens; Chapter 12 Ima Screens; Ima Overview; What You Need To Know - ZyXEL Communications MSC1024G Series User Manual

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H A P T E R
This chapter describes how to configure settings related to the E1 ports on an IMA line card.

12.1 IMA Overview

Inverse Multiplexing for ATM (IMA) is a technology used to transmit ATM traffic over a
bundle of T1 or E1 lines. The IMA line card supports up to 8 E1 ports for E1 connections.
With the IMA line card installed, the IES is able to connect both IP and ATM networks. See
IMA Application

12.2 What You Need to Know

IMA Group
An IMA group is a virtual link that combines one or multiple E1 lines in order to increase total
bandwidth for link. You must configure and enable at least one IMA group to use the IMA line
card. You must check the settings on the remote connected ADM (Add-Drop Multiplexing)
device before configuring an IMA group. In the IES device:
• you can configure up to 8 IMA groups for each IMA line card.
• you can configure up to 64 IMA groups in total on your IES device.
TLS and Tagged PVC
Transparent LAN Service (also known as VLAN stacking or Q-in-Q) allows a service provider
to distinguish multiple customers VLANs. TLS adds an outer VLAN tag (S-tag) to the IEEE
802.1Q tagged (C-tag) frames that enter the network. This allows a service provider to provide
different services, based on specific VLANs, for many different customers. Refer to
11.8.6 on page 236
To bridge untagged traffic through DTPVCs, the IMA line card removes S-tag and C-tag from
frames and converts them into ATM cells according to VLAN ID to PVC mappings. One
combination of S-tag and C-tag maps to one PVC. For example, if a service provider (S1) has
three customers (C1~C3), the service provider has to configure three DTPVCs on both local
and remote IMA devices. The VLAN ID to PVC mappings should be configured on the both
IMA devices.
MSC1000G/1024G/1224G Series User's Guide
on page 45.
for more information.
12

IMA Screens

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