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JunosE 11.3.x Physical Layer Configuration Guide
80
On I/O modules that support APS/MSP, each primary port has a corresponding
redundant port. The number of the primary port, but not that of the redundant port, is
used to identify the interface. The primary port is above the corresponding redundant
port on the I/O modules.
Primary port numbers range from 0 to n–1, where n is the total number of primary ports
on the module. For example, if a module has one primary port, that port is labeled 0.
On some I/O modules, redundant ports are labeled with a port number followed by
the letter R. For example, port 3R is the redundant port for the primary port labeled 3.
However, on some two-port modules, the primary port is labeled 0 and the redundant
port is labeled 1.
On I/O modules that support APS/MSP, the port numbers for the working (primary)
interfaces are assigned the lower half of the numbered interfaces, whereas the port
numbers for the protect (redundant) interfaces are assigned the upper half of the
numbered interfaces. For example, on an I/O module that provides four primary ports
and four redundant ports, the working interface ports are numbered 0–3 and the protect
interface ports are numbered 4–7. Similarly, on an I/O module that provides one primary
port and one redundant port, the working interface is port 0 and the protect interface
is port 1.
APS/MSP channel number—Identifier of the working or protect (redundant) interface
for configuration purposes. (See "Bidirectional Switching Mode" on page 73.)
The protect interface is always assigned channel number 0. The working interface is
always assigned channel number 1.
See "Configuring Channelized T3 Interfaces" on page 3, for information about slot
numbering.
For information about installing line modules and I/O modules in ERX routers, see ERX
Hardware Guide, Chapter 4, Installing Modules.
E120 and E320 Routers
Use the slot/adapter/port format to identify unchannelized SONET/SDH interfaces.
NOTE: The E120 and E320 routers do not support path channelization.
slot—Number of the slot in which the line module resides in the chassis.
In the E120 router, line module slots are numbered 0–5. In the E320 router, line module
slots are numbered 0–5 and 11–16. For both routers, slots 6 and 7 are reserved for SRP
modules; slots 8–10 are reserved for switch fabric modules (SFMs).
adapter—number of the bay in which the I/O adapter (IOA) resides.
This identifier applies to the E120 and E320 routers only. In the software, adapter 0
identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter
1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).
Copyright © 2010, Juniper Networks, Inc.
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