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Configure T3 Interfaces

T3 is the physical layer protocol used by the Digital Signal level 3 (DS3) multiplexing method in North America. A T3 interface operates at a bit rate of 44.736 Mbps. The JUNOS software supports payload scrambling and subrate operation on each physical T3 interface. One encapsulation format, PPP, Frame Relay, or HDLC, must be configured for the interface. DS3 standards supported include:

To configure T3-specific physical interface properties, include the t3-options statement at the [edit interfaces interface-name] hierarchy level: 

[edit interfaces interface-name]

t3-options { 

    bert-algorithm algorithm; 

    bert-error-rate rate; 

    bert-period seconds; 

    (cbit-parity | no-cbit-parity); 

    compatibility-mode (adtran | digital-link | kentrox | larscom | verilink) 

          <subrate value>; 

    fcs (32 | 16);

    (feac-loop-respond | no-feac-loop-respond);

    idle-cycle-flag value; 

    (long-buildout | no-long-buildout);

    (loop-timing | no-loop-timing);

    loopback (local | payload | remote); 

    (payload-scrambler | no-payload-scrambler); 

    start-end-flag value; 

}

You can configure the following T3 interface-specific properties:

For an example of T3 interface configuration, see Examples: Configure T3 Interfaces.

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