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Upgrade and Maintenance, cont’d
Matrix 12800 Switchers • Upgrades and Maintenance
6-12
PRELIMINARY
Changing the nc terination
In a sync BME, the first eight physical inputs on each I/O card are equipped with
sync termination DIP switches. Each switch provides the option of selecting either
510 ohms or 75 ohms.
Change the sync termination of the sync I/O card as follows:
1. If changing the configuration of an installed card, open and remove the front
door.
2. On the I/O cardcage door, turn the left and right knurled knobs ¼-turn
counterclockwise. Lower the door.
C
Do not touch the electronic components or the connectors on the backplane
or on the circuit cards without being electrically grounded. Handle circuit
cards by their edges only. ESD can damage ICs, even if you cannot feel,
see, or hear it.
3. Select the correct input card and the sync termination DIP switch specific
for the input to change (figure 6-10). Rock the DIP to the rear for 75-ohm
termination (the default setting). Rock the switch to the front for 510-ohm
termination.
N
All input numbers identified in figure 6-10 are physical inputs.
1 2 3 4 5 6 7 8
1
2
3
4
5
6
7
8
DIP
Switches
Switch
DIP
switch
Input
card 1
Input
card 2
Input
card 3
Input
card 4
1
2
3
4
5
6
7
8
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Input 8
Input 33
Input 34
Input 35
Input 36
Input 37
Input 38
Input 39
Input 40
Input 65
Input 66
Input 67
Input 68
Input 69
Input 70
Input 71
Input 72
Input 97
Input 98
Input 99
Input 100
Input 101
Input 102
Input 103
Input 104
Figure 6-10 — Sync termination DIP switch
4. Raise the I/O cardcage door to vertical and turn the left and right knurled
knobs ¼-turn clockwise.
5. Close the front door.