Connecting NEMI and DEMI Modules

This chapter describes how to connect the NEMI and DEMI modules used in the Cisco Metro 1500 series system. This chapter includes the following sections:

Connection Equipment

Use the following connection equipment to connect the NEMI and DEMI modules:

9- to 16-channel system
- One external bus cable to link the internal bus of the NEMI and DEMI modules
- Two bus terminators— BUS 1 and BUS 2 ports on the NEMI module (the internal bus has to be terminated)
17- to 32-channel system
- One external Ethernet 10BASE-T hub with a minimum of three ports
- Two Ethernet cables to connect the NEMI-master and the NEMI-slaves to the Ethernet hub
- Two external bus cables to link the internal bus of the NEMI and DEMI modules
- Four bus terminators—BUS 1 and BUS 2 ports on the NEMI modules (the internal bus has to be terminated)
128-channel ESCON system
- One external Ethernet 10BASE-T hub with a minimum of five ports
- Four Ethernet cables to connect the NEMI-master and the NEMI-slaves to the Ethernet hub
- Four external bus cables to link the internal bus of the NEMI and DEMI modules
- Eight bus terminators —BUS 1 and BUS 2 ports on the NEMI modules (the internal bus has to be terminated)

Connecting NEMI Modules to DEMI Modules

Use the external bus cable supplied to connect the NEMI in the primary chassis with the DEMI in extension chassis A. Figure 7-1 shows an external bus connector cable.

Note The external bus cable is included in the same box that contains the DEMI.

Figure 7-1:
External Bus Connector Cable

The bus interconnect port two (BUS 2) on the DEMI connects it to the NEMI. BUS 1 port must be terminated with the bus terminator supplied to eliminate extraneous noise on the bus. Figure 7-2 shows the bus terminator.

Figure 7-2: Bus Terminator

For a 17- to 32-channel system or for a 128-channel ESCON system, the NEMI-slaves in the extension chassis are connected to the DEMI modules in the extension chassis in the same manner as described in the "Connection Equipment" section.

Figure 7-3 shows how to connect the NEMI-master or the NEMI-slave with a DEMI.

Figure 7-3: Connecting a NEMI (Master or Slave) to a DEMI Module

Connecting NEMI Modules to an Ethernet Hub

Cisco Metro 1500 series systems with a total of 17 to 32 WCMs require the NEMI-master to be installed in the primary chassis. The NEMI-master is then connected to the NEMI-slave installed in extension chassis B.

Systems with up to 128 ESCON channels require a NEMI-master to be installed in the primary chassis. The NEMI-master is then connected to the NEMI-slaves in extension chassis C, E, and G.

Both NEMI-master and NEMI-slaves must be connected to an external Ethernet hub with Ethernet cables. Figure 7-4 shows an example of these configurations.

Once interconnected, the NEMI modules exchange management and configuration control information across a private IP network. For information about configuring this private network, refer to the Cisco Metro 1500 Series Software Configuration Guide.

Figure 7-4: Connecting NEMI Modules with an External Ethernet Hub

To connect NEMI modules to an Ethernet hub, follow these steps:

Step 1 Use an Ethernet crossover cable (X-cable).

Step 2 Attach one end of an approved Ethernet cable to the RJ-45 Ethernet port of the NEMI-master in the primary chassis.

Step 3 Attach the other end of the cable to the RJ-45 Ethernet port of the external Ethernet hub. (See Figure 7-4.)

Step 4 Repeat these steps for all NEMI-slaves installed in chassis C, E, and G.

Table of Contents

Connecting NEMI and DEMI Modules

Connection Equipment

Connecting NEMI Modules to DEMI Modules

Connecting NEMI Modules to an Ethernet Hub