Supervisory Signaling - Juniper CTP2000 Series Hardware Manual

See Table 2 on page 18
page 45 for the connector A and B pinouts.
Table 2: Signal Definitions
Signal Name
Port x T, R
Port x T1, R1
Port x E
Port x M
Port x SG
Port x SB
GND

Supervisory Signaling

Supervisory signaling is the means by which a telephone user requests a service or initiates a call. The
signaling unit (CTP platform) interacts with the trunk unit (PBX) by means of either two or four leads,
depending on the signaling type. (See
the trunk side controls the M lead. The two signaling states are on-hook and off-hook. During inactivity
both units are on-hook. See
4WE&M module.
NOTE: 4WE&M and 4WTO audio paths are always up independent of the signaling state.
for signal definitions. See
Signal Definition
Audio transmit pair, 600 Ohm
Audio receive pair, 600 Ohm
E lead–output
M lead–input
Input for signal ground for signaling type II
Output signal battery (–48V) for signaling type II. Note that JP17 must be in
position 1-2.
Signal ground. E and M leads are referenced to this ground for signaling types
I and V. Use JP26 to connect this ground to chassis ground.
Figure 19 on page
Table 3 on page 20 for a summary of signaling types supported by the CTP2000
"CTP2000 4WE&M Interface Connector Pinouts" on
19.) The signaling unit controls the E lead, whereas
18