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Example: Channelized STM1 IQ Interface Configuration

Figure 8: Channelized STM1 IQ Interface Example

Image g003097.gif

This example shows how to configure a channelized STM1 IQ interface on M-series or T-series routing platforms. Figure 8 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 8, 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.



[edit]
interfaces {


cau4-0/0/0 {
partition 1-10 interface-type e1; # Creates interfaces
e1-0/0/0:1 through :10.
partition 11 interface-type ce1; # Creates a single channelized
E1 interface:


sonet-options {                    #
e1-0/0/0:11.
vtmapping itu-t; # This selects ITU-T as the VT mapping
frame format.
}


}




cstm1-0/0/0 {
no-partition interface-type cau4; # Creates a channelized
AU-4 interface:
}              #
cau4-0/0/0.




e1-0/0/0:1 {        # Channel
e1-0/0/0:1 is a fractional E1 interface.
encapsulation ppp;


e1-options {
timeslots 2-21; # Setting time slots on an E1 channel makes
a fractional E1.
}




unit 0 {


family inet {
address 10.133.0.1/30;
}


}


}




e1-0/0/0:2 { # Channels e1-0/0/0:2 through :10 are standard
E1 interfaces.
encapsulation ppp;


unit 0 {


family inet {
address 10.133.0.5/30;
}


}


}


...


e1-0/0/0:10 {
encapsulation ppp;


unit 0 {


family inet {
address 10.133.0.37/30;
}


}


}





ce1-0/0/0:11 { # Channel ce1-0/0/0:11
is a channelized E1 interface.

partition 1 timeslots 2-11 interface-type
ds; # These statements

partition 2 timeslots 12-21 interface-type
ds; # create channel groups.
partition 3 timeslots 22-31 interface-type ds;
partition 4 timeslots 32 interface-type ds; # This statement
creates a single NXDS0 channel.
}




ds-0/0/0:11:1 { # This channel group contains 10 DS0s.


unit 0 {


family inet {
address 10.134.1.1/30;
}


}


}




ds-0/0/0:11:2 { # This channel group contains 10 DS0s.


unit 0 {


family inet {
address 10.134.2.1/30;
}


}


}




ds-0/0/0:11:3 { # This channel group contains 10 DS0s.


unit 0 {


family inet {
address 10.134.3.1/30;
}


}


}




ds-0/0/0:11:4 { # Channel ds-0/0/0:11:4 is a standard DS0
interface.


unit 0 {


family inet {
address 10.134.4.1/30;
}


}


}


}

Figure 9 shows a visual representation of the E1-to-STM1 SDH mapping method used by Juniper Networks in its channelized STM1 IQ interface.

Figure 9: Channelized STM1 IQ Interface SDH Mapping Method

Image g003098.gif

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