Chapter 3. Installation
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Safety Precautions
Observe the following safety precautions when installing the D/I Mux III system.
• Never install telephone wiring during an electrical storm.1
• Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
• Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
• Use caution when installing or modifying telephone lines.
Installing Cards in Shelf
1. Put on a grounded wrist strap. The wrist strap should touch the skin and be grounded
through an approximately one-megohm resistor to the terminal block screw labeled GND on
the D/I Mux III backplane.
2. With the line card still in its static-shielded bag, loosen the captive screw at the top of the line
card front panel.
3. Pull forward the top of the front panel until it is at right angles from its former position.
4. Remove the plug-in card from the static-shielded bag.
5. Place jumpers in appropriate positions for each line card, as directed in specific line card
user manuals.
6. Slide the unit as far as it will go into the correct card slot in the D/I Mux III shelf.
7. Return the front panel to its upright position so it locks into the shelf.
8. Push evenly and firmly on card front panel then apply firm pressure to lower part of front
panel to ensure the card is securely seated in the shelf slot, and tighten the captive screw.
Removing Cards From Shelf
To remove cards from the shelf, reverse the installation procedure as follows.
1. Put on a grounded wrist strap. The wrist strap should touch the skin and be grounded
through an approximately one-megohm resistor to the terminal block screw labeled GND on
the D/I Mux III backplane.
2. Loosen the captive screw at the top of the line card front panel.
3. Pull forward the top of the front panel until it is at right angles from its former position.
4. Slide the unit out of the card slot in the D/I Mux III shelf.
5. Replace line card in a static-shielded bag.
6. Return the front panel to its upright position, and tighten the captive screw.
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