Connecting to the Network

This chapter discusses cable connections to your network.

Connecting to the Admin. Interface

This section discusses connecting a console terminal to the admin. interface port at the rear of the concentrator. Use the terminal for initial setup of the concentrator. Continued use of a terminal is optional. You also can access the admin. interface using Telnet (if you have configured an IP address and subnet mask). You can have only one Telnet connection per concentrator. The admin. interface port is an EIA/TIA-232 DTE device, configured at the factory with the following communications parameters: 9,600 baud, no parity, eight data bits, one stop bit.

After you connect a terminal, you can use the admin. interface set baud command to change the line speed. For information on this command, refer to the section "set baud" in the appendix "Command Reference."

To connect a terminal to the admin. interface port, use the supplied RJ-45-to-DB-25 modular adapter cable. (See Figure 4-1.) For admin. port pinout information, refer to the section "Admin. Port Cabling" in the appendix "Cabling Specifications."

Figure 4-1: Admin. Port RJ-45-to-DB-25 Cable--Two Views

Connecting to the Dual Ring

In a CDDI or FDDI network, CDDI or FDDI A ports connect to CDDI or FDDI B ports, and B ports connect to A ports. (See Figure 4-2.) You can avoid
A-to-A and B-to-B connections by using the tabs on the connectors and applying labels to each cable segment. A-to-B and B-to-A UTP cabling requires a modular, cross-connect cable to correctly attach the transmit and receive pairs. Both 1-foot (30.5 cm) and 7-foot (2.13 m) cross-connect, category 5, data-grade, modular cables are available from us.

Figure 4-2: Concentrators in a Dual-Ring Configuration--CDDI Shown

To ensure proper operation, the correct A-to-B and B-to-A relationship is very important.

Cascaded Concentrators

In a cascaded configuration, the A or B port of a concentrator connects to the M port of another concentrator. If the A or B port is a CDDI port, use an
RJ-45 modular cross-connect cable to connect to the M port of the other concentrator. If the A or B port is an FDDI port, use a CDDI-FDDI translator to convert to CDDI and allow a connection to the M port. Figure 4-3 shows two examples of cascaded concentrators--CDDI and FDDI.

Figure 4-3: Cascading Concentrators

Dual Homing Concentrators

In a dual homing configuration, both the A and B ports of a concentrator connect to the M ports of two other concentrators. (See Figure 4-4.)

Figure 4-4: Dual Homing with CDDI and FDDI A/B Ports

If the A and B ports of the dual homed concentrator have CDDI interfaces, use modular cross-connect cables to connect to the M ports of the other concentrators. (See Figure 4-4.)

Connecting a CDDI-FDDI Translator

In a mixed configuration (CDDI/FDDI), use a CDDI-FDDI translator (Model Number WS-C703) to connect between the two media: modular UTP (category 5) or STP and optical fiber. In Figure 4-5, a modular cross-connect cable is used to connect a CDDI port on a switch to a CDDI-FDDI translator. A MIC is used to connect the other side of the translator to an FDDI port on a concentrator.

Figure 4-5: CDDI-FDDI Translator Configuration

For more information on CDDI-FDDI translator connections for CDDI/MLT-3, refer to the appendix "Cabling Specifications."

Connecting an Optical Bypass Switch

You can connect an optical bypass switch to maintain connectivity to the FDDI ring. If the concentrator enters a fault condition or is powered down or rebooted, the ring will not wrap if an optical bypass switch is present on the faulty concentrator.

Figure 4-6 shows how the optical bypass switch connects to the ring and concentrator. The dashed lines in the optical bypass switch show its function when it is in use. Make certain to maintain the A-to-B and B-to-A relationships.

Figure 4-6: Connecting a Bypass Switch

After you connect the optical bypass switch and reset the concentrator, check the show system display (see the "show system" section of the appendix "Command Reference"). The Bypass field should indicate that the switch is "present." Also check the LED next to the optical bypass switch receptacle on the rear panel (if required).

Cabling Procedures

Following are the instructions for connecting your CDDI/FDDI Workgroup Concentrator to a patch panel, punch-down block, inside wiring, and wall jack.

Figure 4-7 shows a complete wiring configuration from the concentrator (top) to the workstation (bottom).

Figure 4-7: Wiring Overview

Step 1 Connect the concentrator ports to the patch panel.

Use only an approved, high-performance, category 5, data-grade, modular UTP cable to connect ports on the concentrator to the patch panel. (See Figure 4-8.) Modular cables are available from us or other vendors. Use only cross-connect cables to connect the CDDI ports.

Note Use of a patch panel is optional. At a minimum, the patch panel must be compatible with category 5, data-grade components.

Figure 4-8: Cabling from Patch Panel to Concentrator

Step 2 Connect the patch panel to the punch-down block. (See Figure 4-9.)

Connect each port in the patch panel to the punch-down block. Use UTP data-grade cable and follow the AT&T 258A or EIA-568 standards.

Note The use of a punch-down block is optional. At a minimum, the punch-down block must be compatible with category 5, data-grade components.

Figure 4-9: Cabling from Patch Panel to Punch-Down Block

Step 3 Terminate the horizontal wiring at a punch-down block.

The term horizontal wiring refers to the cables installed from the wall jacks (at various office locations) to the wiring closet. If you use a punch-down block, terminate your horizontal wiring at the punch-down block according to the AT&T 258A or EIA-568 standards. If you do not use a punch-down block, use a patch panel.

Step 4 Terminate the horizontal wiring at each wall jack.

Connect the horizontal wiring at each wall panel according to the AT&T 258A or EIA-568 standards. At a minimum, wall jacks must be compatible with category 5, data-grade components.

Step 5 Connect the workstation to the wall plate.

Workstations should be connected to RJ-45 wall jacks with high-performance, category 5 UTP modular cables.
(See Figure 4-10.) A seven-foot modular cable is supplied with each adapter. A one-foot cable is also available from us.

Figure 4-10: Cabling from a Workstation to the Wall Plate

Checking the Installation

Before you apply power, inspect the concentrator thoroughly. Verify that all cables are installed correctly. Check for proper ventilation above and below, front and rear. After power is applied, verify that the status LED on the front panel is green.

Applying Power

The chassis does not have an on/off power switch. Power is on when the chassis is connected to the AC source. Check the power rating of your electrical outlet before connecting any devices to the wall outlet or a power strip. Contact the facilities manager or a qualified electrician if you are not sure what type of power is supplied to your building.

The concentrator requires 110 VAC, 2.5A, 60 Hz or 230 VAC, 1.6A, 50 Hz power. The power supply in the concentrator automatically switches to match the input power.

Use the supplied power cable to connect the concentrator to a properly grounded electrical outlet. After ensuring proper power, plug the female end of the supplied power cord into the connector on the rear of the concentrator.
(See Figure 4-11). Then plug the male end of the power cord into a properly grounded electrical outlet. There is no on/off switch on the chassis.

Note Read the warning messages in this section for important power-related information.

Figure 4-11: Power Cable Connector on the Concentrator--Partial Rear-Panel View

United Kingdom Warnings

To apply power to the device, connect the power cord. To disconnect power to the device, disconnect the power cord. There is no on/off switch. Use only a properly grounded electrical outlet. The electrical outlet must be installed near the equipment, easily accessible, and properly grounded.

Power should come from a building branch circuit. Use a maximum breaker current rating of 20A for 110V, or 8A for 230V. Note the power consumption ratings of each device before you connect to a power source.

The device is designed to work with single phase power systems having a grounded neutral conductor. To reduce the risk of electric shock, do not plug the device into any other type of power system. Contact your facilities manager or qualified electrician if you are not sure what type of power is supplied to your building.

Not all power cords have the same current ratings. Household extension cords do not have overload protection and are not designed for use with computing devices. Do not use household extension cords with your device.

Avertissements pour la France

Pour mettre le dispositif sous tension, connectez le câble d'alimentation. Pour le mettre hors tension, déconnectez le câble d'alimentation. Il n'y a pas de bouton marche-arrêt. Utilisez exclusivement une prise de courant électrique correctement mise à la terre. Cette prise de courant doit se trouver à proximité du matériel, facile d'accès, et correctement mise à la terre.

L'alimentation électrique doit être fournie par un circuit de branchement du bâtiment. Utilisez un disjoncteur d'une puissance nominale maximum de
20 A en 110 V ou de 8 A en 230 V. Notez la puissance consommée par chaque dispositif avant d'établir la connexion à une source d'alimentation.

Le dispositif est conçu pour fonctionner avec des systèmes d'alimentation monophasés munis d'un conducteur neutre mis à la terre. Pour éviter tout risque d'électrocution, ne branchez pas le dispositif dans un système d'alimentation différent. En cas de doute quant au type d'alimentation électrique du bâtiment, adressez-vous au directeur de l'exploitation ou à un électricien qualifié.

Tous les câbles d'alimentation n'ont pas la même intensité nominale. Les rallonges d'usage domestique n'offrent pas de protection contre les surcharges et ne sont pas conçues pour être utilisées avec les systèmes d'ordinateurs. N'utilisez pas de rallonge d'usage domestique avec ce dispositif.

Deutsche Warnhinweise

Das Gerät wird durch Anschließen des Netzkabels ein- und durch Herausziehen des Netzkabels ausgeschaltet. Es ist kein Netzschalter vorhanden. Verwenden Sie nur ordnungsgemäß geerdete elektrische Steckdosen. Die Steckdose muß in der Nähe des Geräts, mühelos zugänglich und ordnungsgemäß geerdet sein.

Der Strom sollte von einer Abzweigleitung des Gebäudes stammen. Der maximale Nennstrom des Unterbrechers sollte 20 Ampere bei 110 Volt und 8 Ampere bei 230 Volt betragen. Stellen Sie vor dem Anschließen an eine Stromquelle den Nennleistungsverbrauch aller Gerät fest.

Das Gerät ist für Einphasennetze mit geerdetem Mittelleiter ausgelegt. Schließen Sie das Gerät nicht an andere Netzarten an, da sonst Elektroschockgefahr besteht. Wenn Sie sich nicht sicher sind, mit welcher Art von Netzstrom Ihr Gebäude versorgt wird, wenden Sie sich an den Anlagenverwalter oder einen qualifizierten Elektriker.

Nicht alle Netzkabel sind für den gleichen Nennstrom ausgelegt. Haushaltsverlängerungskabel Gewöhnliche Haushalts haben keinen Überlastungsschutz und sind nicht für den Gebrauch mit EDV-Geräten geeignet. Verwenden Sie keine Haushaltsverlängerungskabel für das Gerät.

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