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Before installing the CDDI/FDDI Workgroup Concentrator, read this chapter carefully.
Follow these guidelines to ensure general safety:
Follow these guidelines when working on equipment powered by electricity.
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when electronic components are improperly handled and can result in complete or intermittent failures. Always follow ESD-prevention procedures when removing and replacing components. Ensure that the chassis is electrically connected to earth ground using an ESD mat or a ground wire. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the metal part of the chassis.
Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and 10 megohm. |
Following are the site requirements for installation.
Choose a clean, dust-free, (preferably) air-conditioned location. Avoid direct sunlight, heat sources, or areas with high levels of electromagnetic interference (EMI).
Because the front of the concentrator chassis provides status indicators that you may need to monitor and the reset switch, make the front panel accessible. Leave at least 24 inches (60.9 cm) clearance (recommended) at the rear of the concentrator for easier cabling and service.
Two fans located at the front of the chassis cool the chassis interior. One fan always operates, and the other automatically switches on if the ambient temperature of the concentrator exceeds 95°F (35°C). The fans draw air through vents in the front and exhaust heated air through holes in the rear.
The source electrical outlet should be installed near the concentrator, be easily accessible, and be 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 unit before you connect to a power source.
Following are the cabling requirements for installation. For pinouts of the following cable types, refer to the appendix "Cabling Specifications."
The multimode FDDI connectors on the concentrator accept 62.5/125-micron multimode fiber, or 50/125-micron multimode fiber, with standard FDDI MICs. The single-mode connectors accept 8.7 to 10/125-micron single-mode fiber, with standard FDDI ST-type connectors. Table 2-1 lists FDDI distance specifications and Figure 2-1 and Figure 2-2 illustrate single-mode and multimode connectors, respectively.
Transceiver Type | Maximum Distance Between Stations |
---|---|
Single-mode | 18.6 miles (up to 30 km) |
Multimode | 1.2 miles (up to 2 km) |
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI card when no cable is connected. Avoid exposure and do not stare into open apertures. |
Check all existing cables for conformance with CDDI/MLT-3 distance requirements and to ensure that you have the proper connectors (modular
RJ-45). Following are cable and distance specifications:
When you plan your CDDI installation, remember the following:
As with all signaling systems, EIA/TIA-232 signals can travel a limited distance at any given bit rate; generally, the slower the data rate, the greater the distance. Table 2-2 describes the relationship between baud rate and maximum distance. The EIA/TIA-232 admin. port requires a modular RJ-45 connector for the switch end and an RJ-45-to-DB-25 connector for the console terminal to which it will attach.
Data Rate (baud) | Distance (feet) | Distance (meters) |
---|---|---|
2,400 | 200 | 60 |
4,800 | 100 | 30 |
9,600 | 50 | 15 |
19,200 | 25 | 7.6 |
38,400 | 12 | 3.7 |
Table 2-3 lists the tools and materials you will need to install the concentrator. The concentrator can be mounted in a standard 19-inch rack, on a wall in your wiring closet or office, or placed on a desktop in a work area.
Type of Installation | |||
Tools and Materials | Wall | Rack | Desk |
Rack-mount kit (standard):
2 brackets | - | Yes | - |
Wall-mount kit1(optional):
2 brackets | Yes | - | - |
No. 2 Phillips screwdriver | Yes | Yes | - |
Flat-blade screwdriver (to remove A/B port cards or blank plates) | Yes | Yes | Yes |
3/8'' (0.952 cm) drill with 1/4'' (0.635 cm) bit | Yes | - | - |
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