JUNOS 8.4 Network Interfaces Configuration Guide

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Configuring Serial Interfaces

Devices that communicate over a serial interface are divided into two classes: data terminal equipment (DTE) and data circuit-terminating equipment (DCE). Juniper Networks Serial Physical Interface Cards (PICs) have two ports per PIC and support full-duplex data transmission. These PICs support DTE mode only. On the Serial PIC, you can configure three types of serial interfaces:

EIA-530—An Electronics Industries Alliance (EIA) standard for the interconnection of DTE and DCE using serial binary data interchange with control information exchanged on separate control circuits.
V.35—An ITU-T standard describing a synchronous, physical layer protocol used for communications between a network access device and a packet network. V.35 is most commonly used in the United States and in Europe.
X.21—An ITU-T standard for serial communications over synchronous digital lines. The X.21 protocol is used primarily in Europe and Japan.

The following standards apply to serial interfaces:

TIA/EIA Standard 530, High-Speed 25-Position Interface for Data Terminal Equipment and Data Circuit-Terminating Equipment, defines the signals on the cable and specifies the connector at the end of the cable.
TIA/EIA Standard 232, Interface between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange, describes the physical interface and protocol for serial data communication.
ITU-T Recommendation V.35, Data Transmission at 48 kbit/s Using 60-108 kHz Group Band Circuits. Note that the Juniper Networks Serial PIC supports V.35 interfaces with speeds higher than 48 kilobits per second.
ITU-T Recommendation X.21, Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment for Synchronous Operation on Public Data Networks.

There are no serial interface-specific logical properties. For information about general logical properties that you can configure, see Configuring Logical Interface Properties.

To configure serial physical interface properties, include the serial-options statement for the J-series routing platform at the [edit interfaces se-pim/0/port] hierarchy level or at the [edit interfaces se-fpc/pic/port ] hierarchy level for M-series and T-series routing platforms:




[edit interfaces se-fpc/pic/port]



serial-options {


clock-rate rate;


clocking-mode (dce | dte | loop);


control-polarity (negative | positive);


cts-polarity (negative | positive);


dcd-polarity (negative | positive);





dce-options {


control-signal (assert | de-assert |
normal);


cts (ignore | normal | require);


dcd (ignore | normal | require);


dsr (ignore | normal | require);


dtr signal-handling-option;


ignore-all;


indication (ignore | normal | require);


rts (assert | de-assert |
normal);


tm (ignore | normal | require);

}





dsr-polarity (negative | positive);





dte-options {


control-signal (assert | de-assert |
normal);


cts (ignore | normal | require);


dcd (ignore | normal | require);


dsr (ignore | normal | require);


dtr signal-handling-option;


ignore-all;


indication (ignore | normal | require);


rts (assert | de-assert |
normal);


tm (ignore | normal | require);

}





dtr-circuit (negative | positive);


dtr-polarity (negative | positive);


encoding (nrz | nrzi);


idle-cycle-flag flag;


indication-polarity (negative | positive);


line-protocol protocol;


loopback mode;


rts-polarity (negative | positive);


tm-polarity (negative | positive);


transmit-clock invert;

}

This chapter discusses configuration of the following serial interface properties:

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