Chapter 3, Communication Interface Module

The CIM can extend the controller area network (CAN) bus of the ONS 15252 MCU to another MCU or to an ONS 15201 SCU. This arrangement allows several network elements (NE) to work together as a larger functional unit.

The CIM is also the interface to the Maintenance Manager (MM) software package. This interface makes any PC equipped with required hardware a platform for ONS 15200 system surveillance, troubleshooting, and maintenance. A EIA/TIA-232 (NONE standard) port (Tx, Rx, Ground) is available on the CIM, which is accessible with an additional CIM adapter cable.

3.1.2 Alarm and Supervisory Subunit

The CIM is active, but does not include alarm or supervisory subunit functions.

3.1.3 Front-Panel Indicators, Connections, and Adjustments

Connections include two internal bus (INT BUS) interfaces and the management access (MA) interface. Figure 3-2 illustrates these connections.

Figure 3-2 CIM connectors

Three LEDs show NCB module signals on the front of the CIM (Table 3-1).

Table 3-1 CIM Panel NCB Signals

LED Color	Significance
Red	Critical or major alarm in the sub-network
Yellow	Minor alarm or warning in the sub-network
Green	NCB power on

3.1.4 System Relationship

The CIM is installed in the ONS 15252 MCU. The CIM makes it possible to extend the ONS 15252 MCU internal CAN bus to another ONS 15252 MCU or an ONS 15201 SCU. The extension of the CAN bus allows the configuration of several network elements into a larger functional unit.

Additionally, the CIM provides:

Interface to the MM software package (with suitable hardware)
Termination of the internal data bus (CAN bus)
EIA/TIA-232 (NONE standard) access interface to the ONS 15252 MCU

Note Information is transferred to the CIM from the Network Control Board (NCB) module via the ONS 15252 MCU backplane.

3.2 Technical Specifications

This section covers electrical, environmental, and mechanical specifications for the CIM. Because the CIM is not an optical device, optical specifications and default thresholds do not apply.

3.2.1 Electrical Specifications

Power supply: 4.5 VDC

3.2.2 Environmental Specifications

Table 3-2 lists CIM climate-related limits during normal operation.

Table 3-2 CIM Climatic Limits

Item	Specification
Operating temperature	5 to 40°C (41 to 104°F)
Operating relative humidity	5 to 85%, non-condensing

3.2.3 Mechanical Specifications

Table 3-2 lists CIM mechanical specifications.

Table 3-3 CIM Mechanical Specifications

Item	Specification
Height	95 mm (3.8 in.)
Width	20 mm (0.8 in.)
Depth	250 mm (9.8 in.)

3.3 Removal and Replacement

This section explains the removal and replacement procedures for the CIM. The replacement module and any supplies, such as tagging materials, should be present on site before beginning the removal and replacement procedures.

Warning The ONS 15252 Multichannel Unit (MCU) is energized with -48 VDC power.

Caution Static electricity can damage electro-optical modules. While handling electro-optical modules, wear a grounding wrist strap to discharge the static buildup. Wrist straps are designed to prevent static electricity damage to equipment.

The CIM is installed in the ONS 15252 MCU. Only replace the CIM if it is malfunctioning. In that case, the CIM should be replaced immediately.

Procedure: Remove the Communication Interface Module from the ONS 15252 MCU

Warning Follow proper safety procedures when removing modules without switching off the relevant subrack.

Step 1 Use a slotted or Phillips screwdriver to loosen the retaining screw on the CIM.

Step 2 Remove the module from the slot directly below the NCB module (see Figure 3-3).

Figure 3-3 CIM and NCB modules in an ONS 15252 MCU

Procedure: Replace the Communication Interface Module in the ONS 15252 MCU

Caution Make sure the CIM gets properly inserted into the ONS 15252 MCU guide rails.

Step 1 Insert the CIM into the slot directly below the NCB module (see Figure 3-3).

Step 2 Fit the module properly in the short guiding rail on the bottom.

Step 3 When the module is seated, use a slotted or Phillips screwdriver to tighten the retaining screw.

Table of Contents

Communication Interface Module

3.1 Functional Description

3.1.1 Module Function