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# Platform Considerations

You can configure POS interfaces on the following E-series routers:

- E120 router
- E320 router
- ERX-1440 router
- ERX-1410 router
- ERX-710 router
- ERX-705 router
- ERX-310 router

## Module Requirements

For information about the modules that support POS interfaces on ERX-14xx models, ERX-7xx models, and the ERX-310 router:

- See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
- See ERX Module Guide, Appendix A, Module Protocol Support for information about the modules that support POS.

For information about the modules that support POS interfaces on the E120 router and the E320 router:

- See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module specifications.
- See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the modules that support POS.

## Interface Specifiers

The configuration task examples in this chapter use the slot/port[.subinterface ] format to specify a POS interface. However, the interface specifier format that you use depends on the router that you are using.

For ERX-7xx models, ERX-14xx models, and ERX-310 routers, use the slot/port[.subinterface ] format. For example, the following command specifies a POS interface on slot 0, port 1 of an ERX-7xx model, ERX-14xx model, or ERX-310 router.

`

host1(config)#interface pos 0/1

`

For E120 and E320 routers, use the slot/adapter/port format, which includes an identifier for the bay in which the I/O adapter (IOA) resides. 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). For example, the following command specifies a POS interface on slot 5, adapter 0, port 0 of an E320 router.

`

host1(config)#interface pos 5/0/0

`

For more information about supported interface types and specifiers on E-series routers, see Interface Types and Specifiers in JUNOSe Command Reference Guide.

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