Specifications

XMU+ Installation and Maintenance Guide rev.07 109
Upgrading Line Cards
Upgrading Line Cards
Your XMU+ can be upgraded to provide new functionality. While standard static discharge
precautions should be observed, it is not necessary to power down the XMU+ before
working with line cards. See Standard XMU+ Tasks on page 107 for details.
In order to make the line card replacement fast and easy, you should have a medium
flat-blade screwdriver and a small Philips screwdriver on hand.
To remove a line card
1. Take the XMU+ offline. See To take the XMU+ offline on page 107.
2. Locate the line card that you want to remove.
3. Remove the cabling from the back of the line card.
4. Loosen the two thumbscrews on either end of the line card’s faceplate.
5. Pull the line card straight out.
To install a new line card
This procedure for installing (or reinstalling) XMU+ line cards applies only to the
following types of line cards:
 Hybrid Analog.
 Low Impedance.
 MWR.
See page 110 for instructions for installing (or reinstalling) T1 and MOH line cards.
1. Remove any line cards that conflict with the new line card to be installed.
See Understanding Line Card Population Rules on page 30 and To remove a line card
on page 109 for more information.
2. Locate the slot where the new line card will reside and ensure the faceplate does not
have a warning sticker, as shown in Understanding Line Card Population Rules on
page 30.
3. Remove the blank faceplate or existing line card. See To remove a line card on page
109 for more information.
4. Line up the line card’s circuit board on the plastic rails in the chassis.
5. Slide the line card into place.
When seating the line card, there should be slight resistance.
6. Tighten the thumbscrews on either end of the line card’s faceplate.
7. Attach the appropriate cable. See Cabling XMU+ Line Cards on page 54.
8. Confirm that the XMU+ recognizes the new line card. See To verify line card
operation on page 111.
 Passive (found on older XMU units).
 Interactive (found on older XMU units).
Caution...
Forcing the line
card into place
could cause the
pins on the
connector to bend.