Connecting Ethernet Switch Network Modules to a Network

Table Of Contents

Connecting Ethernet Switch Network Modules

Ethernet Switch Network Modules

Requirements for Installing Two Ethernet Switch Network Modules in a Single Chassis

Power Considerations

Restrictions for Cisco 3700 Series Routers

Restrictions for Cisco 2600 Series and Cisco 3600 Series Routers

Connecting the Ethernet Switch Network Module to the Network

Adding an Optional Gigabit Ethernet Expansion Board

Adding an Optional Power Board

Ethernet Switch Network Module LEDs

Connecting Ethernet Switch Network Modules

This chapter describes how to connect Ethernet switch network modules and contains the following sections:

• Ethernet Switch Network Modules

• Requirements for Installing Two Ethernet Switch Network Modules in a Single Chassis

• Power Considerations

• Connecting the Ethernet Switch Network Module to the Network

• Adding an Optional Gigabit Ethernet Expansion Board

• Adding an Optional Power Board

• Ethernet Switch Network Module LEDs

Tip To determine whether your router supports a specific network module, see Table 1-6 on page 1-16.

Ethernet Switch Network Modules

This chapter explains how to install the 16- and 36-port Ethernet switch network modules. The Ethernet switch network module is a modular, high-density voice network module that provides Layer 2 switching across Ethernet ports. The 16-port Ethernet switch network module has 16 10/100BASE-TX ports and an optional 10/100/1000BASE-T Gigabit Ethernet port. The 36-port Ethernet switch network module has 36 10/100BASE-TX ports and 2 optional 10/100/1000BASE-T Gigabit Ethernet ports. The 36-port Ethernet switch network module requires a double-wide slot. An optional power module can also be added to provide inline power for IP telephones.

The10/100BASE-TX ports and Gigabit Ethernet ports on the Ethernet switch network module are connected to the network using RJ-45 connectors on the front panel. The power module is connected to an external power supply using a power connection cable. The front of the 16-port card is shown in Figure 17-1. The front panel of the 36-port card is shown in Figure 17-2.

Figure 17-1 16-Port Ethernet Switch Network Module

Figure 17-2 36-Port Ethernet Switch Network Module

Requirements for Installing Two Ethernet Switch Network Modules in a Single Chassis

A maximum of two Ethernet switch network modules can be installed in a single chassis. If two Ethernet switch network modules of any type are installed in the same chassis, the following configuration requirements must be met:

•Both Ethernet switch network modules must have an optional Gigabit Ethernet expansion board installed.

•An Ethernet crossover cable is connected to the two Ethernet switch network modules using the optional Gigabit Ethernet expansion board ports.

•Intrachassis stacking for the the optional Gigabit Ethernet expansion board ports is configured. For information about intrachassis stacking configuration, see the 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 series feature document.

Without this configuration and connection, duplications will occur in the VLAN databases, and unexpected packet handling may occur.

Power Considerations

The Ethernet switch network module supports inline powering of IP telephones with -48-V power. This allows IP phones to be plugged into the standard RJ-45 jack and be powered from this source rather than having a separate plug into an AC wall outlet. The Ethernet switch network module requires delivery of -48-V power to the network module in order to provide inline powering of IP telephones.

Cisco 2800 series, Cisco 3700 series, and Cisco 3800 series routers supply -48 V power internally (with AC-IP power supplies) to the Ethernet switch service modules. To support Cisco 2600 series and Cisco 3600 series routers, which do not supply -48-V internal power, the network module has an external connector for connection to an external -48-V power supply.

The Ethernet switch network module distributes the -48-V power to each of the Ethernet ports that are configured for line power. Each port can be independently configured for line power.

Note When using the NM-16ESW network module with the MWR 1941-DC router, shielded cables are required, and IP phone inline power is not supported.

Restrictions for Cisco 3700 Series Routers

Cisco 3700 series routers contain internal -48-V power supplies to supply power to the Ethernet switch network module.

For the Cisco 3745 router, the following specifications apply:

•The Cisco 3745 router can have one or two internal -48-V power supplies. The internal supplies of the Cisco 3745 router are configured to be redundant by default.

•With a single power supply, the Cisco 3745 router can provide up to 360 W. This is enough power for up to 36 10-W IP phones. With two nonredundant power supplies, 640 W can be provided, supporting up to 64 10-W IP phones.

•The Cisco 3745 router main board has four independent signals to indicate status on both internal power supplies. Changes on the state of any of these four signals interrupts the main processor on the Cisco 3745 router so software can take the appropriate action.

Cisco 3725 routers have a single -48-V supply. Cisco 3725 routers do not report any power supply status. The only software indication of -48-V status is the -48-V status bit provided on the 16-port Ethernet switch network module board.

Restrictions for Cisco 2600 Series and Cisco 3600 Series Routers

Cisco 2600 series and Cisco 3600 series routers do not supply -48-V power, so an external -48-V supply is required to support inline power for IP phones. This external power supply connects to the Ethernet switch network module faceplate with a cable.

An external power supply plugged into an Ethernet switch network module provides power only for that specific network module. To supply redundant power, a Y cable can be used so that two external power supplies are connected to the same card.

For more information about external power supplies, see the Cisco External Power Supply for Cisco Ethernet Switch Network Modules Installation Guide.

Connecting the Ethernet Switch Network Module to the Network

Warning Voltages that present a shock hazard can exist on inline power circuits if interconnections are made by using uninsulated exposed metal contacts, conductors, or terminals. Avoid using such interconnection methods unless the exposed metal parts are in a restricted access location and users and service people who are authorized to access the location are made aware of the hazard. A restricted access area can be accessed only through the use of a special tool, lock and key, or other security means. Statement 1072

The Ethernet switch network module is connected to an Ethernet switch or hub with RJ-45 cables. (See Figure 17-3.) RJ-45 cables are not provided with the network module. For ordering information, see the "Obtaining Technical Assistance" section on page xi.

Note When using the NM-16ESW with the MWR 1941-DC router, shielded cables are required.

Tip For information about RJ-45 crossover cables, go to the following URL:
http://www-tac.cisco.com/Support_Library/Hardware/LAN_Switches_and_
Modules/Cat6000/Troubleshooting/QuickTip.998950447.html

Figure 17-3 16-Port Ethernet Switch Card Connected to Ethernet Switch or Hub

Adding an Optional Gigabit Ethernet Expansion Board

An optional Gigabit Ethernet expansion board can be installed to support a 10/100/1000BASE-T Gigabit Ethernet port.

To install a Gigabit Ethernet expansion board, follow these steps:

Step 1 Use a Phillips screwdriver to remove the cover on the Gigabit Ethernet board port, as shown in Figure 17-4.

Figure 17-4 Gigabit Ethernet Board Port Cover on the Ethernet Switch Network Module

Step 2 Guide the external connector through the Gigabit Ethernet expansion port opening on the card faceplate.

Step 3 Insert the connector on the Gigabit Ethernet expansion board into the board connector on the network module. Inspect the board to ensure that the board is fully connected. (See Figure 17-5 for 16-port Ethernet switch network modules or Figure 17-6 for 36-port Ethernet switch network modules.)

Caution Be sure to press firmly on the Gigabit Ethernet expansion board until the board seats correctly onto the connector. When the Gigabit Ethernet expansion board is seated properly, the standoff is flush with the board. If this board is not firmly seated, failures can occur.

Step 4 Insert the screw from the board installation kit through the Gigabit Ethernet expansion board into the standoff on the network module.

Figure 17-5 Installing a Gigabit Ethernet Expansion Board on a 16-Port Cisco Ethernet Switch Network Module

Figure 17-6 Installing a Gigabit Ethernet Expansion Board on a 36-Port Cisco Ethernet Switch Network Module

Adding an Optional Power Board

An optional power board can be used if the Ethernet switch network module requires external -48-V power for IP telephones. Installation and configuration of the external power supply system is described in the Cisco External Power Supply for Cisco Ethernet Switch Network Modules Installation Guide.

To install power boards, follow these steps:

Step 1 Use a Phillips screwdriver to remove the cover on the external power board port, as shown in Figure 17-7.

Figure 17-7 Power Board Port Cover on the Ethernet Switch Network Module

Step 2 On the power board, remove the thumb screws on either side of the power board port. Put these in a safe place, because they will be replaced when the power board is installed.

Step 3 Guide the external connector through the power board port opening on the card faceplate.

Step 4 Insert the connector on the power board into the connector on the network module. (See Figure 17-8 for 16-port Ethernet switch network modules and Figure 17-9 for 36-port Ethernet switch network modules.)

Note Be sure to press firmly on the power board until the board seats correctly onto the connector.

Step 5 Insert the screws from the board installation kit through the power board into the standoffs on the network module.

Step 6 Replace the thumbscrews on either side of the power board port. Make sure that the thumbscrews are tightened firmly.

Warning Do not connect the external power supply cable to the power connector on the front of the network module until the network module has been inserted into the router chassis.

Step 7 After installing the network module into the chassis, connect the power cable to the power module connector on the front of the network module. See the Cisco External Power Supply for Cisco Ethernet Switch Network Modules Installation Guide for more information.

Figure 17-8 Installing a Power Board in a 16-Port Ethernet Switch Network Module

Figure 17-9 Installing a Power Board in a 36-Port Ethernet Switch Network Module

Ethernet Switch Network Module LEDs

Figure 17-10 shows 16-port Ethernet switch network module LEDs. Figure 17-11 shows 36-port Ethernet switch network module LEDs. Table 17-1 describes their meaning.

Figure 17-10 16-Port Ethernet Switch Network Module LEDs

Figure 17-11 36-Port Ethernet Switch Network Module LEDs

Table 17-1 Ethernet Switch Network Module LEDs

LED

Meaning

0-16 (for 16-port)
0-36 (for 36-port)

Green indicates that individual Ethernet port is functioning.

-48-V

Off indicates that no -48-V power is going to the network module.

Green indicates -48-V power is present on the network module.

Amber indicates that there is a problem with one or more of the internal or external -48-V power supplies.

GE

Green indicates that the Gigabit Ethernet port is functioning.

EN

Green indicates that the module has passed its self-tests and is available to the router.

LED	Meaning
0-16 (for 16-port) 0-36 (for 36-port)	Green indicates that individual Ethernet port is functioning.
-48-V	Off indicates that no -48-V power is going to the network module. Green indicates -48-V power is present on the network module. Amber indicates that there is a problem with one or more of the internal or external -48-V power supplies.
GE	Green indicates that the Gigabit Ethernet port is functioning.
EN	Green indicates that the module has passed its self-tests and is available to the router.