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Configuring Fractional E1 Time Slots

 

Overview

An E1 interface consists of 32 time slots. By default, all the time slots on an E1 interface are used. Time slot 0 is always reserved for framing and cannot be used to configure a fractional E1 interface.

Time slot numbering constraints vary for different E1 PICs, as follows:

  • For 4-port E1 PICs, the configurable time slot range is 1 through 31 (time slot 0 is reserved for framing).

  • For 10-port Channelized E1 and 10-port Channelized E1 Intelligent Queuing (IQ) PICs, the configurable time slot range is 2 through 32 (time slots 0 and 1 are reserved for framing).

  • For Enhanced Intelligent Queuing (IQE) PICs, the configurable time slot range is 2 through 32.

  • NxDS0 time slots configured on either a channelized STM1 IQ interface or a channelized E1IQ interface are numbered from 1 to 31 (0 is reserved), while fractional E1 time slots are numbered from 2 to 32 (0 and 1 are reserved).

  • For fractional E1 interfaces only, if you connect a 4-port E1 PIC to a device that uses time slot numbering from 2 through 32, you must subtract 1 from the configured number of time slots.

Note
  • To configure ranges, use hyphens.

  • To configure discontinuous time slots, use commas. Do not include spaces.

Configuration

Configuring Fractional E1 Time Slots

Step-by-Step Procedure

  1. In the configuration mode go to the [edit interfaces interface-name e1-options] hierarchy level.
  2. Include the timeslots statement.

    Following examples illustrates how to configure different time slots at the [edit interfaces interface-name e1-options] hierarchy level.

    • To configure time slots 4 through 6, 11, and 25:

    • To configure time slots 1 through 10:

    • To configure time slots 1 through 5, 10, and 24:

  3. Include the framing g704 statement at the [edit interfaces e1-fpc/pic/port e1-options ] hierarchy level.

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