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COMSPHERE ±48 Vdc Central Office Power Unit
Setting the Option Straps
The option straps are screw switches that are set by raising (loosening) or lowering (tightening) the screw to break or make the contact. There are five option straps, S1 through S5, on the CO Power Unit's backplane (see Figure
NOTE
Older power modules have straps labeled S1 and S2. These should always be in the raised position.
Basic Mode
If you want to operate in the Basic mode, you must use one ± 48 Vdc power source and configure the option straps as shown in Table
Table
Settings for Basic Mode
S1 Lowered
S2 Lowered
S3 Lowered
S4 Lowered
S5 Lowered
To set the option straps for Basic mode of operation:
"Procedure
1.Tighten the screws on all five straps (S1 through S5) on the CO Power Unit's backplane. Make sure that the screws are securely touching the contacts, but do not screw the straps too tight because doing so can damage the equipment.
CO Power Tray
S1
S3
CO Power Unit
Backplane
S5 S2
S4
Figure 2-2. Option Straps (S1 through S5) on the CO Power Unit's Backplane
May 1998 |