The Juniper Networks CTP150 Circuit to Packet platform optionally includes a replaceable CTP150–IM-SER serial interface module that can be paired with another module of the same type or a T1/E1 interface module. The serial interface module also has the option of supporting two multiservice daughter cards for 4-KHz or high quality analog audio, or interrange instrumentation group (IRIG) signals. See CTP150 Multiservice Interface Module for details.
The four-port serial interface module supports individual cabling for each port. The CTP150 ports have small serial ports for HD-26 26-pin connectors (see Figure 1). The lowest-numbered port (marked 0) is at the bottom left, and the highest-numbered port (marked 3) is at the top right.
Figure 1: CTP150 Serial Interface Module
The software-selectable interfaces for the module are RS-232/V.24, EIA530/X.21, EIA530A, V.35, and IRIG. Software-selectable rates range from 50 bps to 12.228 Mbps.
The module also includes an external clock reference port for an HD-26 connector. Note that only one external clock reference is required even if there are two interface modules, serial or T1/E1.
![]() | Note: The external clock reference port must be the one in module slot 0, the right-most slot in the front of the CTP150 chassis. |