Clock Rtm Module - Juniper CTP1000 Series Hardware Manual

The main clock module has six RJ-45 ports, one DB-25 port, and two inputs (BITS
and TTL) that will be enabled in a future software release. Each RJ-45 port can be
connected to one spoke module. The spoke module has one ingress RJ-45 port and
one DB-25 interface. See Figure 27 and Figure 28.
When an external reference (main clock RTM DB-25 RS-422 input) is used, it can be
the only reference on the node. If you use port 0–3 node references, you can have
multiple prioritized references on the node.
Figure 27: Clock Main Module (CTP-CLK-Main)
Figure 28: Clock Spoke Module (CTP-CLK-Spoke)
There are no configurable options for the clock module. Main modules and spoke
modules are not hot-swappable.
There are some installation requirements:

Clock RTM Module

The clock rear transition module (RTM) is used to input a reference clock into the
CTP2000 system. The module is installed in the rear of the chassis behind the
CTP2000 interface modules with ports 0–7. The clock RTM module is the first slot
above the processor RTM on the CTP2008 system, and the first slot below the
processor RTM on the CTP2024 and CTP2056 systems. The module provides a
DB-25 connector, and the differential clock input is provided on pins 24 and 11.
Nonvoice modules and voice modules can be installed in any slot.
Main RTMs must be installed in slot 0 behind either a serial or T1/E1 card.
Spoke RTMs must be installed behind serial cards and the lowest-numbered
T1/E1 slot.
If a T1/E1 card is installed in slot 0, a spoke RTM is not needed behind any
T1/E1 cards. They will sychronize to the H.100 clock.
For systems with only nonvoice boards (serial or T1/E1 card), only a main RTM
is needed for external node reference input.
Chapter 1: CTP System Overview
CTP2000-Series Modules
23