To configure a DS1 on an STS1 with a channelized DS3 payload:
Create the STS1 path and set the payload to DS3.
Create the channelized DS3 on the STS1 path.
Create the DS1 on the DS3.
Use the info command to display configuration information.
         sonet-sdh
             path sts1-1
                 payload ds3
                 no shutdown
             exit
         exit
         tdm
             ds3 1
                 channelized ds1
                 no shutdown
             exit
             ds1 1.1
                 no shutdown
             exit
         exit
         no shutdown
Notes:
the CLI identifier for the path command is sts1-stsNum, where:
stsNum is the STS number, which can be 1, 2, or 3
the CLI identifier for the TDM ds3 command is ds3Num, where:
ds3Num is equal to stsNum
In the example above, DS3 is configured on sts1-1, hence the numbering ds3 1. If sts1-2 or sts1-3 was configured instead of sts1-1, the corresponding DS3 configuration would be ds3 2 or ds3 3, respectively.
the CLI identifier for the TDM ds1 command is ds3Num.ds1Num, where:
ds1Num is the DS1 number. Because a DS3 can carry 28 T1s, ds1Num can be between 1 and 28.