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Numbering Scheme
Copyright © 2010, Juniper Networks, Inc.
Figure 1: Stack for Channelized T3 Interface
For more information about the layers in a channelized T3 interface, see "Numbering
Scheme" on page 7.
NOTE: For a detailed description of interface types and specifiers, see
Interface Types and Specifiers in JunosE Command Reference Guide. For
information about interfaces, see Planning Your Network in JunosE System
Basics Configuration Guide.
This section describes how to identify each layer in a channelized T3 interface stack.
T3 Controllers
A T3 controller on a channelized T3 interface is identified using the slot/port format
where:
slot—Number of the slot in which the line module resides in the chassis.
In ERX7xx models, line module slots are numbered 2-6; slots 0 and 1 are reserved for
SRP modules. In ERX14xx models, line module slots are numbered 0–5 and 8–13; slots
6 and 7 are reserved for SRP modules. In an ERX310 router, line module slots are
numbered 0–2; slot 0 is reserved for the SRP module.
port—Number of the port on the I/O module. On a CT3/T3 12 I/O module, ports are
numbered 0–11.
For information about installing line modules and I/O modules in ERX routers, see ERX
Hardware Guide, Chapter 4, Installing Modules.
T1 Channels
A T3 line consists of 28 T1 channels (or data streams). A T1 channel is identified by its
number in the range 1–28.
Each T1 channel is an aggregate of 24 DS0 timeslots, as shown in Figure 2 on page 8.
To configure an entire T1 line, assign 24 timeslots to each channel.
Chapter 1: Configuring Channelized T3 Interfaces
7
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