3Com 3C8S5007 - SuperStack II PathBuilder S500 Switch User Manual page 128

128 A E: T
PPENDIX ROUBLESHOOTING
DS3Lpbk !<path> -PA T3Intrnl
d To start a loopback test to an external device in T3 mode, use:
DS3Lpbk !<path> -PA T3Passive
e To start an internal E3 framer loopback test, use:
DS3Lpbk !<path> -PA E3Intrnl
f To start a loopback test to an external device in E3 mode, use:
DS3Lpbk !<path> -PA E3Passive
g To start receiving and looping back data from the network by entering
one of the following commands.
To receive and loop back data from the network without
performing any framing or deframing, use:
DS3Lpbk !<path> -PA Network1
To receive and loopback data from the network after performing
any necessary deframing and framing (framing and deframing
applicable in T3/E3 mode), use:
DS3Lpbk !<path> -PA Network2
3 An example of successful loopback output appears as follows:
[4] EnterpriseOS # ds3lpbk !4 HSSIPassive
[5] EnterpriseOS # T3 Interface; Self Tests passed -slot 4
Tues Dec 8 12:29:17 1998 Loopback for WAN slot B successful
An example of failed loopback output appears as follows:
[4] EnterpriseOS # ds3lpbk !4 T3Passive
[5] EnterpriseOS #
Tues Dec 8 11:15:16 1998 Loopback for WAN slot B failed
4 To abort any loopback test in progress, use:
DS3Lpbk !<path> -PA DS3LbkStop
Failure to perform this step causes the port to remain in loopback mode
preventing connectivity through the port. Performing diagnostics on the
port will reveal only that the port is down.
5 Enable the path using:
SETDefault !<path> -PA Control=Enable