User manual

Chapter 3. Operation
61200105L3-1A E&M+ Dual Voice Option ModuleUser Manual 3-9
Figure 3-8. View Signaling Bits Display
Set Transmit Signal
S
ET TX SIGNAL forces the A and B signal bits in the TX direction
to a desired state for test.
Set E-Lead
S
ET E-LEAD forces the E-lead output to a desired state for test. Set
to G
ROUNDED or OPEN.
Loopback
Set L
OOPBACK to ENABLE to provide a bidirectional analog loop-
back toward the network and toward the connected equipment. Use
the loopback test to verify proper functioning of connected cables
and equipment.
In TO mode, if the 2713 T
ONE DET option is ENABLED, the bidi-
rectional analog loopback can also be initiated by sending a
2713 Hz control tone from the network side (L3 versions only).
1
RXA
0
RXB
0
TXA
1
TXB
TEST / 5)LOOPBACK forces a loopback state while CONFIG /
5)2713 T
ONE DET only enables or disables the 2713Hz control
tone detection coming from the network.