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Interface Stack
Figure 1 on page 7 shows the stack for a channelized T3 interface. To configure a
channelized T3 interface, configure a T3 controller, followed by a T1 channel, and
then a fractional T1 channel. Finally, you must configure a High-Speed Data Link
Control (HDLC) data channel on the interface.
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.
Numbering Scheme
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:
For information about installing line modules and I/O modules in ERX routers, see
ERX Hardware Guide, Chapter 4, Installing Modules.
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.
Chapter 1: Configuring Channelized T3 Interfaces
Platform Considerations
7
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