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Example: Channelized STM1 IQ Interface Configuration

 
Figure 1: Channelized STM1 IQ Interface Example
Channelized STM1 IQ Interface Example

This example shows how to configure a channelized STM1 IQ interface on M-series or T-series routing platforms. Figure 1 shows the breakdown of one channelized STM1 IQ interface into a variety of channels and the conversion of the second interface into a clear channel STM1.

For the first interface, you must first convert the STM1 interface into a channelized Administrative Unit 4 (AU-4) interface with the no-partition and interface-type cau-4 statements at the [edit interfaces cstm1-fpc/pic/port] hierarchy level. You must specify KLM or ITU-T AU-4 formatting with the vtmapping statement at the [edit interfaces cau4-fpc/pic/port sonet-options] hierarchy level. From the channelized AU-4 interface, you can create E1 channels or channelized E1 channels. The channelized E1 channels can be further broken into DS0 time slots.

To create E1 channels, include the partition statement at the [edit interfaces cau4-fpc/pic/port] hierarchy level with the interface-type e1 option. To create channelized E1 channels, include the partition statement at the [edit interfaces cau4-fpc/pic/port] hierarchy level with the interface-type ce1 option.

After you have established a channelized E1 channel, you can split it into a maximum of 31 NxDS0 channels. To create the desired number of NxDS0 channels, include the partition statement with the timeslots and interface-type ds options at the [edit interfaces ce1-fpc/pic/port:channel] hierarchy level. Time slot 1 is reserved in an NxDS0-based channelized E1 channel, so you can use time slots 2 through 32.

To create an NxDS0 channel group, include a range of time slots after the

timeslots option.

You can also create fractional E1 interfaces on a channelized STM1 IQ interface. To configure a fractional E1 interface, include the partition statement at the [edit interfaces cau4-fpc/pic/port] hierarchy level and select the interface-type e1 option. After you commit this part of the configuration, a clear channel E1 interface is established. You can configure standard E1 options on this interface. To fractionalize the E1 interface, include the timeslots statement at the [edit interfaces e1-fpc/pic/port e1-options] hierarchy level. Time slot 1 is reserved in a fractional E1 channel, so you can use time slots 2 through 32.

In the second interface shown in Figure 1, you convert the channelized STM1 IQ interface into a clear channel STM1 interface. To configure, include the no-partition and interface-type so statements at the [edit interfaces cstm1-fpc/pic/port] hierarchy level.

Figure 2 shows a visual representation of the E1-to-STM1 SDH mapping method used by Juniper Networks in its channelized STM1 IQ interface.

Figure 2: Channelized STM1 IQ Interface SDH Mapping Method
Channelized STM1 IQ Interface SDH
Mapping Method

Verifying Your Work

To verify correct operation of a channelized STM1 IQ interface, use the following commands:

  • show interfaces

  • show interfaces controller

  • show interfaces interval (for channelized STM1, E1, and channelized E1 channels)

To view the interface names of the physical channelized STM1 IQ interface and the channels configured on this interface, use the show interfaces controller command:

user@router> show interfaces controller cstm1-0/0/0

To view information about the physical channelized interface, include the cstm1-fpc/pic/port option with the show interfaces command:

user@router> show interfaces cstm1-0/0/0

To view information about the channelized AU-4 channel, include the cau4-fpc/pic/port option with the show interfaces command:

user@router> show interfaces cau4-0/0/0

To view information about an E1 channel, include the e1-fpc/pic/port:channel option with the show interfaces command. In this case, the fractional E1 appears as channel e1-0/0/0:1 and the normal E1 appears as channel e1-0/0/0:2.

user@router> show interfaces e1-0/0/0:1
user@router> show interfaces e1-0/0/0:2

To view information about a CE1 channel, include the ce1-fpc/pic/port:channel option with the show interfaces command:

user@router> show interfaces ce1-0/0/0:11

To view information about an NxDS0 interface, include the ds-fpc/ pic/port:channel:channel option with the show interfaces command. For channel group ds-0/0/0:11:1, the speed of the link is 640 Kbps because it contains 10 DS0s (64 x 10 = 640). For single DS0 channel ds-0/0/0:11:4, the speed of the link is the standard 64 Kbps.

user@router> show interfaces ds-0/0/0:11:1