60
Test Interface Connections
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.
Type
Lead
On-Hook
Off-Hook
I-V
E
Open
Ground
I, III
M
Ground
Battery
II, IV, V
M
OPEN
Battery
CO DID IMMEDIATE
This mode emulates a CO DID-IMMEDIATE circuit. The test set generates DTMF, DP
and MF signaling. It also measures Tip-Ring voltage, current, digit decode, frequency
& level, noise, noise with tone and displays the state of the far-end. In CO DID-
Immediate mode the test set uses a 20mA holding circuit for off-hook conditions. Tap
DIAL to enter the desired dial digit string. To go Off-Hook (Seize the circuit) tap Dial
from the DIAL screen or tap On-hook, the test set draws loop current and outputs the
digits.
CO DID WINK
This mode emulates a CO DID-Wink circuit. The test set generates DTMF, DP and MF
signaling. It also measures Tip-Ring voltage, current, digit decode, frequency & level,
noise, noise with tone and displays the state of the far-end. In CO DID-Wink mode the
test set uses a 20ma holding circuit for off-hook conditions.
In CO DID-Wink, tap
DIAL
to enter the desired dial digit string. To go Off-Hook (Seize
the circuit) tap dial from the DIAL screen or tap Off-hook to initiate drawing loop current
and monitor for WINK (Tip/Ring polarity reversal). Once detected dialing digits are
then transmitted to the station (PBX). Tap on the
STATE
button to view associated
wink timing measurements.
SELECTIVE SIGNALING (SS1/SS4) 2&3 Digit
Selective Signaling is typically used on aviation point-to-point or multipoint circuits that
allow a caller to dial a two or three digit dial code for destination party. SS uses Fre-
quency Shift Key (FSK) 2400 (make) & 2600Hz (break) at a -8dBm0 level when dialing.
The number of digits in dial code is 2 or 3 with codes of 81 or 729 respectively. 1 can
be used for backspace or digit
– for trouble-shooting it is always displayed when re-
ceived.
Transmitting SS digits:
1. Configure the test set for Selective Signaling (SS) by selecting 4-Wire Signaling
under the 2/4 Wire mode pull down menu (upper left).
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