Northern Telecom DMS-100 Series Manual page 138

9-4 Cabinet and I/O connections
Input/output panel daughter board replacement
Removing the input/output panel daughterboard assembly disconnects
modem links from the TIFNs and current loops from MSPs and SPNs. If
these links are inservice (SMDI connections, remote terminal connections,
or local terminal current loop connections), they should be taken
out-of-service before the daughterboard is removed.
Table 9-1 lists the preparation actions required before removing an
input/output daughter board that is located next to each of the SPM shelves.
Table 9-1xxx
Preparing to remove I/O panel daughter boards
Shelf
26 Right
26 Left
39 Right
39 Left
After the preparation is complete, remove the four hex nuts at the corners of
the NTGX17AA daughterboard. Remove the existing daughterboard and
replace with a new one. Fasten the new daughterboard and then re-enable
the connections that were earlier disabled.
Input/output panel replacement
Before removing an input/output panel, it is recommended that the cabinet
be taken out-of-service and powered down. After the SPM has been
powered down, do the following:
1
2
3
4
297-7001-503 Standard 02.02 March 1994
Node type
MSP1 OA&M Port 3
MSP2 OA&M Port 3
SPN1 Port 1
SPN2 Port 1
TIFN1 Links 1-4
TIFN2 Links 1-4
SPN7 Port 1
SPN8 Port 1
SPN5 Port 1
SPN6 Port 1
TIFN3 Links 1-4
TIFN4 Links 1-4
Label and remove the internal and external cables that are connected to the
input/output panel being removed.
Cut the tie-wraps to cables in the immediate area to allow access to the
input/output panel being removed.
Remove the hex nuts from the input/output panel.
Remove the four slotted screws (two at the top and two at the bottom) from the
input/output panel.
Action required
Removal requires cabinet shutdown.
Remove cables to 68K TMs for
SPN1 and SPN2 before removal.
Removal requires SMDI shutdown.
Remove cables to 68K TMs for
SPN1 and SPN2 before removal.
Remove cables to 68K TMs for
SPN5 and SPN6 before removal.
Removal requires SMDI shutdown.