Specifications

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CSU/DSU MS DBU
Table 8-1. Test Options AT Commands
Front Panel AT Command Description
Test Timeout
ENTER TIMEOUT S18=x Specify 0-255 second test timeout
RDL Enable/Disable
1=RDL IGNORED &T5 RDL request from remote DSU ignored
2=RDL ACCEPTED &T4 RDL request accepted
EIA LLB Enable/Disable
1=DISABLED _A0 No response to local loopback
2=ENABLED _A1 Responds to local loopback
EIA RLB Enable/Disable
1=DISABLED _R0 No response to remote loopback
2=ENABLED _R1 Responds to remote loopback
DBU Answer Test
1=DISABLED none Remote unit does not accept DBU
tests from far end
2=ENABLED none Remote unit accepts DBU tests from
far end
T EST T IMEOUT
The Test Timeout option sets the length of time a CSU/DSU MS DBU remains in
a test mode before automatically returning to the data mode. Enter the timeout as
a two-digit decimal value. The factory-default setting is off (0).
R EMOTE D IGITAL L OOPBACK (RDL)
The RDL option specifies whether the CSU/DSU MS DBU responds to an RDL
request from the far end of the circuit. The factory-default setting is RDL
Accepted.
EIA LLB
The EIA LLB (Electronics Industries Association local loopback) option specifies
whether the CSU/DSU MS DBU responds to the local loopback input from the
DTE. The factory-default setting is Disabled.
EIA RLB
The EIA RLB (remote loopback) option specifies whether the CSU/DSU MS DBU
responds to the RLB input from the DTE. The factory-default setting is Disabled.