Telenetics Corporation FT100 S, Инструкция по установке и эксплуатации

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Front Panel Option Selection
FT 100S 4-11
T1 Network Loopback
Figure 4-2 shows the unit in Network Loopback. The T1 network
received signal is looped back to the network transmitter and also
passed to the DTE port. The DTE port transmit signal is blocked. This
allows testing the T1 network from a remote FT 100S, a remote CSU, or
from the telephone company central office.
All TM LEDs light to indicate a T1 test in progress. Other LEDs func-
tion normally.
PUSHBUTTON ACTION:
YES-
Enters network loopback; advances to T1 NETWORK
LOOP IN PROGRESS - END?
NO- Advances to Remote CSU Loopback?
HOME- Returns to T1 TESTS? submenu
Remote CSU Loopback
Figure 4-3 shows the unit in Remote CSU Loopback. When initiated,
the local FT 100S transmits a loop-up code causing the remote unit to
enter Remotely Activated Network Loopback. The loop-up code is
transmitted until the remote unit enters loopback. The local unit then
resumes normal operation. The remote unit enters loopback after the
loop-up code has been received for at least 4 seconds.
The FT 100S responds to the standard CSU inband loop codes and out-
of-band ESF loop codes received on the FDL. When the loop-up code is
detected, the unit initiates a T1 network loopback. The loopback is
terminated when the loop-down code is received.
When Remote CSU Loopback is terminated, a loop-down code is trans-
mitted causing the remote unit to return to normal operation.
T1 Network
Loopback?
Remote CSU
Loopback?