Figure 15: 86445-31 2W Fxs Unit Analog Loopback - GE JungleMUX 86445-31 Technical Practice And Installation Manual

LOOPBACK
May be set for '–' (loopback off) or ANLG (analog). The loopback
feature is used for test/maintenance purposes only.
In analog loopback mode, the unit internally loops the signal back
towards the far-end unit at the analog side of the CODEC. This
means that a signal transmitted from the far-end will be looped
back to the far-end. This allows to inject a tone from a VF Test Set
connected to the far-end unit and measure the tone received at the
far-end unit. Note that if an external hybrid function cannot be
provided for testing, then an 86444 4W VF unit may be used for
testing purposes.
Note: This field must be set to '-' when not being used for test or
maintenance purposes.
Figure 15: 86445-31 2W FXS Unit Analog Loopback: (a) with 2W
FXO or 2W FXS unit at far end; (b) with 4W VF unit at far end
TRANSMIT SIGNALLING
Allows the user to set a specific signaling condition that will be sent
to the far-end unit and is used for test/maintenance purposes only.
The signaling options available depend on the SIGNALLING TYPE
selected (see SIGNALLING SETUP window).
signaling condition overrides the actual signaling condition sent to
the far-end unit only if TRANSMIT SIGNALLING field in the
SIGNALLING SETUP window is set to TEST mode.
Note: When testing from near end to far end, the far-end unit
RECEIVE SIGNALLING field in the SIGNALLING SETUP window
should be configured to NRML.
Copyright  GE Multilin Inc. 2002
2W FXS 2W FXS
XMT XMT
2W 2W 2W
A/D A/D
2W 2W
VF VF
RCV RCV
D/A D/A
4W 4W 4W
NEAR END NEAR END
2W FXS 2W FXS
XMT XMT
2W 2W 2W
A/D A/D
2W 2W
VF VF
RCV RCV
D/A D/A
4W 4W 4W
NEAR END NEAR END
342-86400-445PS
Issue 4.0
October 2006
Page 89
2W FXO/FXS 2W FXO/FXS
RCV RCV
4W 4W 4W
D/A D/A
XMT XMT
A/D A/D
2W 2W 2W
FAR END FAR END
(a) (a)
4W VF 4W VF
RCV RCV
D/A D/A
XMT XMT
A/D A/D
FAR END FAR END
(b) (b)
2W 2W
VF VF
2W 2W
VF VF
The selected