Juniper JUNOSE 10.0.X PHYSICAL LAYER, Configuration Manual

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ERX-7xx Models, ERX-14xx Models, and the ERX-310 Router
Use the slot/port format to identify unchannelized SONET/SDH interfaces. Interfaces
that support APS/MSP also use the APS/MSP channel number .
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slot—Number of the slot in which the line module resides in the chassis.
In ERX-7xx models, line module slots are numbered 2–6; slots 0 and 1 are
reserved for SRP modules. In ERX-14xx models, line module slots are numbered
0–5 and 8–13; slots 6 and 7 are reserved for SRP modules. In an ERX-310 router,
line module slots are numbered 1–2; slot 0 is reserved for the SRP module.
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port—Number of the port on the I/O module.
On the OC3-2 GE APS I/O module, you can configure only unchannelized
SONET/SDH interfaces on ports 0 and 1; port 2 is reserved for a Gigabit Ethernet
interface.
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.
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APS/MSP channel number —Identifier of the working or protect (redundant)
interface for configuration purposes. (See “Bidirectional Switching Mode” on
page 75.)
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 .
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Platform Considerations
JUNOSe 10.0.x Physical Layer Configuration Guide