Textron Greenlee Communications DataScout 10G, User Manual

Page: 74 / 115

72 4-Wire Noise Measurements
4-wire signaling mode selection is similarly to the 2-Wire Signaling mode where you
have signaling selection and dial functions. Some signaling modes such as Loop Start
and Ground Start are not supported in 4-wire modes. To change signaling modes tap
on Station (PBX) and then select the desired Emulation (CO/PBX) and Signaling type.
Station DID
This mode emulates a DID-IMMEDIATE station (PBX) circuit and generates -48V
dc
battery across TIP and RING and measures Tip-Ring voltage, current, digit decodes,
frequency & level and displays the state of the far-end. The test set monitors for Sei-
zure (far-end CO loop-closure) and displays incoming digits. Default is DTMF/DP digit
decode mode. To decode MF digits tap the receive DTMF/DP text to toggle to MF digit
detection.
Station DID-wink
The test set emulates a DID-WINK station (PBX) circuit. The DataScout 10G gener-
ates -48V
dc
battery across TIP and RING and measures Tip-Ring voltage, current, digit
decodes, frequency & level and displays the state of the far-end. The default mode is
DTMF/DP digit decode. To decode MF digits tap the receive DTMF/DP text to toggle
to MF digit detection.
In Station DID-Wink emulation, the test set detects Seizure (far-end off-hook)
, WINK’s
(reverses the TIP/RING polarity) and then waits for incoming digits. Tap on the Timing
button to view Wink timing measurements.
CO (Signaling)
E&M I-V
– E&M signaling defines a PBX (TRUNK) and a CO (Signaling) using 2 leads
E (Ear or Earth), M (Mouth or Magnet) for Type I and type V, an additional 2 leads (4
total) SG (Signal Ground), SB (Signal Battery) for type II, III, IV. The Signaling (CO)
grounds the E lead to go Off-Hook and monitors the Trunk M lead for battery Off-Hook.
See table below for On-Hook and Off-Hook states for the various E&M types. E&M
Testing provides direct user control of On-hook/Off-hook states and monitoring of Far-
end Hook state in all modes!
Type Lead On-Hook Off-Hook
I-V E Open Ground
I, III M Ground Battery
II, IV, V M Open Battery
Type II, III, IV connect SG and SB pairs to the SG/SB jacks of the unit
Note in Type I and V you CANNOT connect to SG/SB bantam jacks.