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DEFINITY Enterprise Communication Server Release 9
Installation and Maintenance for Survivable Remote EPN 555-233-121
2
SREPN Maintenance
Replacing the TN2301 circuit pack
Replacing the TN2301 circuit pack
!
CAUTION:
EPN service is interrupted until a replacement TN2301 is installed, powered
up, and the EI links restored.
Unseat the circuit pack
1. Power down the cabinet by turning the power switch off.
2. Attach an ESD strap to your wrist.
3. Push the latch pin upward to unlock the locking lever.
4. Pull down on the locking lever until the circuit pack disconnects from its
socket.
5. Pull the circuit pack just enough to break contact with the backplane
connector, but do not remove it from the cabinet.
!
CAUTION:
Ensure that there is enough slack drawn from the extra fiber optic cabling
from the bottom pan of the cabinet to clear the circuit pack from the cabinet
(approximately 18 in. or 46 cm).
Replace the circuit pack
NOTE:
If the same optical transceivers can be reused, then the optical connections
to the transceivers do not have to be removed. Just remove the transceivers
from the old circuit pack and reconnect them to the corresponding connector
positions on the replacement circuit pack.
1. Remove the fiber connections from each transceiver, taking care to note to
which transceiver the cables go and which is the transmit (TX) and receive
(RX) connections for each transceiver. See
November 2000
Figure 2-21 on page
Issue 2
2-39
2-40.
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