User Manual

ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation

Page 3-10

7 OPTICAL CONNECTIONS

The optical interface between the HU and the RU is supported by two optical ports. Each optical

port consists of an SC optical adapter which is mounted on the HU front panel. Port 1 provides

the optical fiber connection for the forward path (downlink) signal. Port 2 provides the optical

fiber connection for the reverse path (uplink) signal.

The optical connections are dependent on whether or not a WDM host module (accessory) or

CWDM host module (accessory) is installed. If the installation does not include either a WDM or

CWDM module, proceed to Section 7.1 for the optical connections procedure. If the installation

includes a WDM module, proceed to Section 7.2 for the optical connections procedure. If the

installation includes a CWDM module, refer to the Digivance System Coarse Wavelength

Division Multiplexer User Manual (ADCP-75-142) for the optical connection procedure.

7.1 Optical Connections Without WDM or CWDM system

Use the following procedure to connect the optical fibers when a WDM or CWDM host module is

not installed with the HU:

1. Obtain two patch cords that are of sufficient length to reach from the HU to the fiber

distribution panel.

2. Designate one of the patch cords as the forward path link and the other as the reverse

path link and attach an identification label or tag next to each connector.

3. Remove the dust caps from the HU optical ports and from the patch cord connectors that

will be connected to the HU.

4. Clean each patch cord connector (follow patch cord supplier’s recommendations).

5. Insert the connector into the appropriate optical port as shown in Figure 3-9.

6. Route the patch cords from the HU to the fiber distribution panel.

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser radiation

can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not

look directly into the optical transmitter of any unit or exposure to laser radiation may result.

An optical power meter should be used to verify active fibers. A protective cap or hood MUST

be immediately placed over any radiating transmitter or optical fiber connector to avoid the

potential of dangerous amounts of radiation exposure. This practice also prevents dirt particles

from entering the connector.

Note: To protect the optical receivers, insert a 15 dB attenuator in each optical path. After

the optical power has been measured, the attenuator may be resized or removed.

Note: The HU optical adapters are angled to the left. Therefore, patch cords should always

be routed to the HU from the left side of the rack. Routing patch cords to the HU from the

right side of the rack may exceed the bend radius limitations for the optical fiber.