Example: Channelized STM1 IQ Interface Configuration
The next example shows how to configure a channelized STM1 IQ interface. Figure 6 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 timeslots.
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. Timeslot 0 is reserved in an NxDS0-based channelized E1 channel, so you can use timeslots 1 through 31. To create an NxDS0 channel group, include a range of timeslots 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. Timeslot 1 is reserved in a fractional E1 channel, so you can use timeslots 2 through 32.
In the second interface shown in Figure 6, 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 timeslots on an E1 channel creates 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 1-10 interface-type ds; # These statements create
partition 2 timeslots 11-20 interface-type ds; # channel groups.
partition 3 timeslots 21-30 interface-type ds;
partition 4 timeslots 31 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 7 shows a visual representation of the E1 to STM1 SDH mapping method used by Juniper Networks in its channelized STM1 IQ interface.
