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Operation
3-133510-A2-GN32-50 January 1998
Table 3-5
Local Loopback – DTE Test Message Procedure
Your Action
DSU Front Panel Response
1. Press the LL test switch. LL indicator lights, TEST indicator flashes. After
about 6 seconds, TEST indicator remains ON.
2. Operate your DTE to send test message. TXD and RXD indicators show interface lead status
while test message is transmitted.
3. Press the LL test switch. LL indicator goes Off. TEST flashes for about
6 seconds, then goes Off.
Table 3-6
Local Loopback – DTE Test Message Alternative Procedure
Your Action
DSU Front Panel Response
1. DTE turns on Pin 18 of the EIA interface or
Pin LL of the V.35 interface
*
which causes the
DSU to perform a Local Loopback.
**
LL indicator lights, TEST indicator flashes. After
about 6 seconds, TEST indicator remains ON.
2. DTE sends test message. TXD and RXD indicators show interface lead status
while test message is transmitted.
**
3. DTE turns off Pin 18 or Pin LL to restore DSU to
normal.
LL indicator goes Off. TEST flashes for about
6 seconds, then goes Off.
*
Pin 18 of the EIA interface or Pin LL of the V.35 interface will not function unless straps S3-3 and S3-4 are
enabled.
**
DSR EIA output and the indicator goes Off during LL unless strap S5-5 (DSR always ON) is enabled.