User's Manual

U
SER
´
S MANUAL FOR BAND SELECTIVE REPEATERS
MR
X
03P
User'sManual.doc Id.-No.:154999 Page 21 22-Jan-01
3.2. EXTERNAL ALARMS
With the external alarms option, it is possible to monitor the status of connected
devices via the repeater software, e.g. a UPS. The DIP-switches of the Ext.-Alarms
switch on the control module have to be set to position ON “Ext. Alarm 1-4”.
∗ Note: If a PSTN modem is required, only two external alarms are
available because the PSTN modem reserves two lines!
The connecting clamps are located on the connecting board mounted on the
duplexer (BTS side).
figure 3-3 Location of external alarm clamps
All external alarms are normally high (5V) without connection. Via the software
command SET LOGIC, the external alarms can be set to high active (H) or low active
(L). Depending on the settings, the external alarms show the status “failure” or “OK”
on the display. The configuration for open collector applications is 5V / 0.5 mA.
When only 2 external alarms are required, ensure that the other 2 external alarms are
set to low active, otherwise the status will always show an alarm.
∗ Note: The name for each external alarm and the name for the alarm
message can be defined by the customer with the corresponding
software command (see software manual)!
∗ Note: A special software blocking must be removed to use the external
alarm option. This can only be carried out by authorized persons
from MIKOM.