Clock Module - Juniper CTP1000 Series Hardware Manual

CTP 5.2 Hardware Guide

Clock Module

22
CTP2000-Series Modules
Type V uses twoleads, the E & M leads, for signaling. During inactivity, both the E
and M leads are open. The CTP system signals off-hook by connecting the E to
ground. The trunk circuit signals off-hook by connecting the M lead to ground. As
with type I, with type V signaling, the two units share a common ground. Type V
signaling allows for signaling units to be connected back-to-back.
Table 6: Supported Signaling Types for the CTP2000-IM-4WEM Module
Signaling Signaling
Type Leads
I E, M
II E, M, SG, SB
V E, M
Clock interface modules provide clock distribution between modules when the
backplane is in use by voice applications. This is accomplished through a
"hub-and-spoke" configuration composed of a main module (CTP-CLK-Main) and a
spoke module (CTP-CLK-Spoke). With the introduction of analog voice and
compression capabilities in the CTP2000 system, it was necessary to use the TDM
bus in the CTP2000 chassis. The TDM bus is used to distribute voice channels
between modules.
Clock main modules (Figure 27) and clock spoke modules (Figure 28) allow more
clock input types in the CTP2000 chassis and provide the capability for clock
distribution when both serial modules and voice modules are installed in the same
CTP2000 chassis.
The main, or hub, module accepts a node reference and repeats it to all RJ-45
connectors. The RJ-45 connectors distribute the clock to all spoke modules. Each
nonvoice cards receives the clock on the first RJ-45 and sends it to the front card.
Figure 26: Hub-and-Spoke Setup
PBX (M Lead)
On-hook Off-hook
Ground Battery
Open SB
Open Ground
Hub Module
Spoke Module
CTP (E Lead)
On-hook Off-hook
Open Ground
Open SG
Open Ground