NMC-RX 7.3.x User Guide, Vol. 1 > Configuring X.21/V.35 Modules > Overview

Overview

X.21 interfaces provide synchronous operation between data communication equipment (DCE) and data terminal equipment (DTE) on public data networks.

V.35 interfaces provide synchronous operation between DCE and DTE for data communication over the telephone network. Although the V.35 standard is considered obsolete and is no longer supported by ITU-T, many V.35 connections still exist in telephone networks.

ERX-7xx models and the ERX-1410 router support the X.21/V.35 line module and I/O module. The ERX-1440 router does not support the X.21/V.35 line module and I/O module.

The X.21/V.35 interface includes an HDLC layer. You can configure other protocols over this HDLC layer.

X.21/V.35 line modules pair with I/O modules to provide particular capabilities and connections.

For complete module details, see Table 56, the ERX Module Guide, and the JUNOSe Physical Layer Configuration Guide.

 Table 56:  X.21/V.35 Line Modules and I/O Modules 

 Line Module
 I/O Module
 Description
 NMC-RX Software 
Reference Name

 X.21/V.35-16

 X.21/V.35-16

 16-port module that supports X.21 and V.35 operation

 X.21/V.35-16 port