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Configuring Channelized T1 IQ and IQE Interfaces

Configuring T1 IQ and IQE Interfaces

To configure a T1 interface, include the no-partition and interface-type statements at the [edit interfaces ct1-fpc/pic/port] hierarchy level:

This configuration creates the interface t1-fpc/pic/port.

Note: For a T1 (t1-) interface configured on channelized T1 (ct1-) interface on a Channelized T1 IQ or IQE PIC, you can configure the following T1 options, but these options do not take effect for the T1 interface: bert-algorithm bert-error-rate bert-period buildout framing line-encoding loopback remote-loopback-respond The T1 interface inherits these option settings from the parent channelized T1 interface.

Configuring Fractional T1 IQ and IQE Interfaces

By default, all the time slots on a channelized T1 interface are used. To configure a fractional T1 interface on a Channelized T1 IQ or IQE PIC, perform the following tasks:

1. Include the no-partition statement at the [edit interfaces ct1-fpc/pic/port] hierarchy level. This configuration creates the interface t1-fpc/pic/port.
   [edit interfaces ct1-fpc/pic/port]no-partition interface-type t1;
2. Configure the number of time slots allocated to the T1 IQ or IQE interface by including the timeslots statement at the [edit interfaces t1-fpc/pic/port t1-options] hierarchy level. DS0 time slots configured on the channelized T1 IQ or IQE interface are numbered from 1 to 24. To configure ranges, use hyphens. To configure discontinuous time slots, use commas. Do not include spaces.
   [edit interfaces t1-fpc/pic/port t1-options]timeslots time-slot-range;

For more information about T1 time slots, see Configuring Fractional T1 Time Slots.

Example: Configuring Fractional T1 IQ and IQE Interfaces

Configure a fractional T1 interface that uses time slots 2 through 10:

For a full configuration example, see the Junos OS Feature Guides.

Configuring NxDS0 IQ and IQE Interfaces

By default, all the time slots on a channelized T1 interface are used. To configure an NxDS0 IQ or IQE interface on a Channelized T1 IQ or IQE PIC, you must configure the number of time slots allocated to the NxDS0 IQ or IQE interface by including the partition, timeslots, and interface-type statements at the [edit interfaces t1-fpc/pic/port] hierarchy level, specifying the ds interface type:

For channelized T1 IQ or IQE interfaces, the partition number range is from 1 through 24.

For channelized T1 IQ or IQE interfaces (t1-fpc/pic/port), the time-slot range is from 1 through 24. You can designate any combination of time slots. To configure ranges, use hyphens. To configure discontinuous time slots, use commas. Do not include spaces. For more information about T1 time slots, see Configuring Fractional T1 Time Slots.

Example: Configuring an NxDS0 IQ or IQE Interface

Configure an NxDS0 interface that uses time slots 2 through 10. This configuration creates the ds-0/0/0:1 interface.

For a full configuration example, see the Junos OS Feature Guides.

Configuring Payload Loopback

Clocking and loopback options are configured at the controller level for all IQ-based and IQE-based interfaces. However, for the channelized T1 IQ or IQE interfaces, configure the payload loopback on the T1 interfaces instead of the channelized T1 IQ or IQE interface. To configure the payload option, include the loopback payload statement at the [edit interfaces t1-fpc/pic/port t1-options loopback] hierarchy level.

By default, all the time slots on a channelized T1 IQ or IQE interface are used. There can be a maximum of 24 channel groups per channelized T1 IQ or IQE interface. Thus, you can configure a maximum of 240 channel groups per PIC.

To specify the DS0 channel group number in the interface name, include a colon (:) as a separator. For example, a Channelized T1 IQ or IQE PIC might have the following physical and virtual interfaces:

x is a DS0 channel group from 1 through 24 (for more information about ranges, see Table 1).

You can use any of the values within the range available for x; you do not have to configure the links sequentially. In addition, the Junos OS applies the interface options you configure according to the following rules:

• To configure the t1-options statement, you must set channel group x to 0:
  ds-0/0/0:0
• There are no restrictions on configuring the ds0-options statement.
• If you delete a configuration you previously committed for channel group 0, the options return to default values.

To configure the channel groups and time slots for a channelized T1 IQ or IQE interface, include the following statements at the [edit chassis] hierarchy level:

There are 24 time slots on a T1 interface. You can designate any combination of time slots. To configure ranges, use hyphens. To configure discontinuous time slots, use commas. Do not include spaces.

Table 1 shows the ranges you can specify.

The theoretical maximum number of channel groups possible per PIC is 10 * 24 = 240. This is within the maximum bandwidth available.

Configuring Channelized T1 Interface Properties

To configure channelized T1 IQ or IQE interface properties, include the t1-options statement at the [edit interfaces interface-name] hierarchy level:

Note: If you configure the line-encoding statement with the ami option and the byte-encoding statement with the nx64 option, excessive zeros in the payload area may bring the interface down. To prevent this, configure the byte-encoding statement with the nx56 option or include the invert-data statement.

To specify options for each of the DS0 channels, include the ds0-options statement at the [edit interfaces interface-name] hierarchy level:

Only a subset of the T1 options is valid for the channelized configuration; you specify the time slots using the [edit chassis] configuration described in Examples: Interface Naming. For more information about the T1 and DS0 options, see T1 Interfaces Overview.

Each T1 interface has 24 time slots (DS0s). You can combine one or more of these DS0 time slots (channels) to create a channel group (NxDS0). There can be a maximum of 24 channel groups per T1 interface.