Specifications

7-28 Cisco MGX 8220 Reference, Release 4.1
Making the BNM Trunk Connection
To install a front card:
Step 1 Position the rear card guides over the appropriate slot at the top and bottom of the card cage.
Step 2 Gently slide the card all the way into the slot and press the insertion/extractor lever until it
snaps into the vertical position.
NoteThe card should slide in and out with only slight friction on the adjacent board’s EMI gaskets.
Do not use force. Investigate any binding.
Removing and Installing the Back Cards
Back cards are retained through two screws: one at the top of the faceplate and one at the bottom of
the faceplate.
To remove a back card:
Step 1 Remove any cables connected to the back card.
Step 2 Use a flat screwdriver to undo the two retaining screws in the back card’s faceplate.
Step 3 Pull both of the two extractor levers out to the horizontal position, this will start the removal
of the card. Gently pull the card out of the card cage.
To install a back card:
Step 1 Ensure the two extractor levers are in the “in” position. When the card is being inserted into
the slot, the levers should be vertical along the line of the back card.
Step 2 Position the rear card guides over the appropriate slot at the top and bottom of the card cage.
Step 3 Gently slide the card all the way into the slot and tighten the two captive screws on the back
card’s faceplate. Tighten the upper and lower screws to prevent misalignment of the card.
Do not overtighten the screws. Tighten to secure the card.
WarningCards must be inserted in the correct slot positions. This is particularly true with back cards. If
service module back cards are inserted into slots intended only for ASC and/or BNM back cards (slots 1, 2,
3, and 4), damage to the card and backplane can result.
If you accidentally attempt to insert a service module back card into slots 1, 2, 3, or 4 and have difficulty in
operating the shelf, examine the backplane pins and the backcard connector to see if they have been bent or
damaged.
Making the BNM Trunk Connection
Connect two T3 coaxial cables between the T3 BNC connectors on the MGX 8220 BNM line
module card and the T3 BNC connectors on the BPX BNI Line Module. The Transmit port on the
BPX line module must connect to the Receive port on the MGX 8220 BNM line module and vice
versa. (See Figure7-22.)