Supervisory Signaling; Table 4: Signal Definitions - Juniper CTP2000 Series Hardware Documentation

Supervisory Signaling

Copyright © 2017, Juniper Networks, Inc.

Table 4: 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 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
signaling unit controls the E lead, whereas 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
Table 5 on page 19 for a summary of signaling types supported by the CTP2000 4WE&M
module.
Chapter 2: CTP2000 Series Interface Modules
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 18 on page 18.) The
17