ADCP-50-304 • Issue 19 • June 1999 • Section 6: Installation

2 CONTROL MODULE AUTOFALLBACK JUMPER INSTALLATION

When the autofallback option is selected, the proper jumper must be installed on the CM (Figure 6-4) before the module is installed in the PS chassis. Each CM has a group of four jumper selections located on the side of the circuit board. Refer to Figure 6-5for an illustration of the autofallback jumpers.

If the jumper is installed in the “AUTO SW B” position, an alarm condition on any module within the PS chassis will cause switching to the “B” position from the “A” position. Similarly, if the jumper is in the “AUTO SW A” position, an alarm condition will cause a switch, to the “A” position from the “B” position. If the automatic switching is not desired, leave the jumper in the “STORE” position.

When installed, the autofallback selection does not override the CM software selection. That is, the software can change the switch position when the jumper strap is installed. However, if the alarm condition persists, the autofallback feature switches it back.

Caution: Do not jumper both the “AUTO SW A” and “AUTO SW B” at the same time. This type of installation causes the circuits to switch positions every time an alarm condition is sensed, and can cause “hunting” if both A and B alarm persists .

It is recommended that systems configured for autofallback have all modules strapped for auto alarm reset.

RS-422 SERIAL CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WHEN IN LOWER POSITION,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC PULSE CONTROL WHEN

AUTOFALLBACK

IN UPPER POSITION

JUMPER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHASSIS

ADDRESS

SWITCH

1563-A

Figure 6-4. Control Module RDM-15

Page 6-6

© 1999, ADC Telecommunications, Inc.