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Configuring Channelized OC12/STM4 IQ Interfaces (SDH Mode)

The Channelized OC12 IQ PIC configured for SDH mode creates a single channelized STM4 interface. You can configure this interface as unpartitioned using the no-partition statement at the [edit interfaces cstm4-fpc/pic/port] hierarchy level to create a single SDH VC-4-4C interface, or you can partition it into the following OC slices:

• SDH virtual concatenation 4 (VC-4) and channelized AU-4 interfaces (4 interfaces, any combination)
• Channelized T3 or T3 interfaces from a channelized AU-4 interface (3 interfaces, any combination)
• Channelized T1 or T1 interfaces from a channelized T3 interface (28 interfaces, any combination)
• NxDS0 interfaces from a channelized T1 interface

Note: If you configure the per-unit-scheduler statement on the physical interface of a 4-port channelized OC-12 IQ PIC and configure 975 logical interfaces or data link connection identifiers (DLCIs), some of the logical interfaces or DLCIs will drop all packets intermittently.

This section describes how to configure the following channelized OC12 IQ interfaces on a Channelized OC12 IQ PIC configured in SDH mode:

Configuring Channelized OC12/STM4 IQ PICs for SDH Mode

To configure a Channelized OC12 IQ PIC to operate in SDH mode, include the framing sdh statement at the [edit chassis fpc fpc/pic/port] hierarchy level:

This configuration creates interface cstm4-0/2/0.

For more information, see the Junos OS System Basics Configuration Guide.

Configuring an Unpartitioned SDH (VC-4-4C) Interface on a Channelized OC12/STM4 IQ PIC

On a Channelized OC12 IQ PIC, you can configure one SDH (VC-4-4C) interface. To configure an SDH (VC-4-4C) interface, include the no-partition and interface-type statements at the [edit interfaces cstm4-fpc/pic/port] hierarchy level:

This configuration creates interface so-fpc/pic/port.

Example: Configuring an Unpartitioned SDH (VC-4-4C) Interface

Configure an unpartitioned SDH (VC-4-4C) interface, using partition 1 and OC slices 4 through 6:

This configuration creates the interface so-0/2/0.

Configuring SDH (VC-4) Interfaces on Channelized OC12/STM4 IQ PICs

To configure an SDH (VC-4) interface on a Channelized OC12 IQ PIC, include the partition, oc-slice, and interface-type statements at the [edit interfaces cstm4-fpc/pic/port] hierarchy level, specifying the so interface type:

This configuration creates interface so-fpc/pic/port:channel.

The partition number is the sublevel interface partition index and is correlated with the channel number. For Channelized OC12 IQ PICs, the OC-slice range can be from 1 through 12.

Note: For channelized OC12 IQ interfaces, channel numbering begins with 1 (:1).

The OC-slice range is the range of SONET/SDH slices. For SDH interfaces, the OC-slice range specifies the bandwidth size required for the interface type you are configuring. SDH (VC-4) interfaces must occupy three consecutive OC slices per interface, in one of the following forms:

• 1–3
• 4–6
• 7–9
• 10–12

The interface type is the channelized interface type or data channel you are creating.

Example: Configuring SDH (VC-4) Interfaces

Configure SDH (VC-4) interfaces:

This configuration creates the interfaces so-0/2/0:1 through so-0/2/0:4.

Configuring Channelized AU-4 Interfaces

To configure a channelized AU-4 interface, include the partition, oc-slice, and interface-type statements at the [edit interfaces cstm4-fpc/pic/port] hierarchy level, specifying the cau4 interface type:

This configuration creates interface cau4-fpc/pic/port:channel.

The partition number is the sublevel interface partition index. For SDH interfaces, the partition number is not correlated with bandwidth size. A channelized STM-4 interface can have from 1 through 4 partition numbers.

Note: For channelized OC12 interfaces, channel numbering begins with 0 (:0). For channelized OC12 interfaces (both IQ and IQE), channel numbering begins with 1 (:1).

The OC-slice range is the range of SONET/SDH slices. For SDH interfaces, the OC-slice range specifies the bandwidth size required for the interface type you are configuring. Channelized AU-4 IQ interfaces must occupy three consecutive OC slices per interface, in one of the following forms:

• 1–3
• 4–6
• 7–9
• 10–12

The interface type is the channelized interface type or data channel you are creating.

Example: Configuring Channelized AU-4 Interfaces

Configure channelized AU-4 interfaces, using partitions 1 through 4:

This configuration creates the interfaces cau4-0/2/0:1 through cau4-0/2/0:4.

Configuring T3 or Channelized T3 Interfaces Under Channelized AU-4 Interfaces

To configure T3 or channelized T3 interfaces, include the partition and interface-type statements at the [edit interfaces cau4-fpc/pic/port] hierarchy level, specifying the t3 or ct3 interface type:

This configuration creates the interfaces t3-fpc/pic/port:channel and ct3-fpc/pic/port:channel.

Note: Class-of-service (CoS) rules cannot be applied to an individual channel configured on channelized IQ interfaces. You can apply CoS rules only to the aggregate bit streams.

Example: Configuring T3 or Channelized T3 Interfaces

Configure T3 and channelized T3 interfaces, using partition 1 and partition 2:

Configuring T1 or Channelized T1 Interfaces Under Channelized AU-4 Interfaces

To configure T1 or channelized T1 interfaces under channelized AU-4 interfaces, include the partition and interface-type statements at the [edit interfaces cau4-fpc/pic/port] hierarchy level, specifying the t1 or ct1 interface type:

This configuration creates the interfaces t1-fpc/pic/port:channel and ct1-fpc/pic/port:channel.

Note: Class-of-service (CoS) rules cannot be applied to an individual channel configured on channelized IQ interfaces. You can apply CoS rules only to the aggregate bit streams.

Example: Configuring T1 or Channelized T1 Interfaces Under Channelized AU-4 Interfaces

Configure T1 and channelized T1 interfaces, using partition 1 and partition 2:

Configuring T1 or Channelized T1 Interfaces Under Channelized T3 Interfaces

To configure T1 or channelized T1 interfaces under channelized T3 interfaces, include the partition and interface-type statements at the [edit interfaces ct3-fpc/pic/port] hierarchy level, specifying the t1 or ct1 interface type:

This configuration creates the interfaces t1-fpc/pic/port:channel and ct1-fpc/pic/port:channel.

Note: Class-of-service (CoS) rules cannot be applied to an individual channel configured on channelized IQ interfaces. You can apply CoS rules only to the aggregate bit streams.

Example: Configuring T1 or Channelized T1 Interfaces Under Channelized T3 Interfaces

Configure T1 or channelized T1 interfaces, using partition 3 and partition 4:

This configuration creates interfaces t1-0/2/0:1:2:3 and ct1-0/2/0:1:2:4.

Configuring NxDS0 Interfaces on Channelized OC12/STM4 IQ PICs

Configure channelized NxDS0 IQ interfaces on the channelized T1 IQ interface by including the partition, timeslots, and interface-type statements at the [edit interfaces ct1-fpc/pic/port:channel] hierarchy level, specifying the ds interface type:

This configuration creates the interface ds-fpc/pic/port:channel.

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. You can use a combination of ranges and discontinuous time slots:

Example: Configuring NxDS0 Interfaces

Configure channelized NxDS0 interfaces, using partition 4 and time slots 1 through 10:

This configuration creates interface ds-0/2/0:1:2:3:4.