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7.16 Configuring T1 Interfaces<br />

Problem<br />

You want to configure the T1 interface on your router.<br />

Solution<br />

Use the following commands to configure a T1 interface:<br />

[edit interfaces]<br />

aviva@RouterF# set t1-0/0/3 unit 0 family inet address 10.0.13.1/24<br />

aviva@RouterF# set t1-0/0/3 description "J2300 T1 line in local office"<br />

<strong>Discussion</strong><br />

The basic configuration to get a T1 interface is very straightforward. You just set the<br />

interface’s IP address. T1 interfaces can handle 24 simultaneous connections, called<br />

channels or timeslots, running at a combined 1.544 Mbps. Each T1 or DS1 packet is<br />

193 bits and consists of 24 8-bit frames that carry data, plus one framing bit. Each<br />

port on a T1 or DS1 PIC can have a maximum of 24 channels.<br />

Once the interface is configured, check its status:<br />

aviva@RouterF> show interfaces t1-0/0/3<br />

Physical interface: t1-0/0/3, Enabled, Physical link is Up<br />

Interface index: 140, SNMP ifIndex: 38<br />

Description: J2300 T1 line in local office<br />

Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1,<br />

Loopback: None, FCS: 16, Framing: ESF<br />

Device flags : Present Running<br />

Interface flags: Point-To-Point SNMP-Traps 16384<br />

Link flags : Keepalives<br />

Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3<br />

Keepalive: Input: 164568 (00:00:06 ago), Output: 164561 (00:00:03 ago)<br />

LCP state: Opened<br />

NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:<br />

Not-configured<br />

CHAP state: Not-configured<br />

CoS queues : 8 supported<br />

Last flapped : 2005-04-15 21:13:25 PDT (5w3d 11:12 ago)<br />

Input rate : 40 bps (0 pps)<br />

Output rate : 48 bps (0 pps)<br />

DS1 alarms : None<br />

DS1 defects : None<br />

Logical interface t1-0/0/3.0 (Index 69) (SNMP ifIndex 40)<br />

Flags: Point-To-Point SNMP-Traps Encapsulation: PPP<br />

Protocol inet, MTU: 1500<br />

Flags: None<br />

Addresses, Flags: Is-Preferred Is-Primary<br />

Destination: 10.0.13/24, Local: 10.0.13.2, Broadcast: 10.0.13.255<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.<br />

Configuring T1 Interfaces | 225

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