INSTALLATION GUIDE FOR RA-7800
RA-7800 QI
Copyright - refer to title page
Page 43
ENU Status : 1-0-1
Pin Number
Definition
Description
1 BTS_OPEN
Connects to the normally opened terminal of the voltage free
relay.
2 BTS_CLOSE
Connects to the normally closed terminal of the voltage free
relay.
3
BTS_COM
Connects to the common terminal of the voltage free relay.
4 ~ 7
NC
Reserved.
Table 17: Pin definition of the BTS_ALM port
Depending on OMT/OMC configuration, alarm to BTS can be signalled from RA-7800 by either: a)
pin1 and pin3 ‘closed’ or b) pin2 and pin3 ‘opened’.
3.5.7 EXTERNAL ALARM CONNECTION
Four external alarms INPUT to RU are realized on the “EXT_ALM” port, this is a 7-pin CPC
connector. The following figure and table shows the pin allocation and definition. Pin numbering are
shown looking-into the connector on the enclosure.
7
6
3
5
4
1
2
Fig 29: Pins allocation for “EXT_ALM”
Pin
number
1 2 3 4 5 6 7
Alarm
definition
EXT.
Alarm 1
EXT.
Alarm 2
EXT.
Alarm 3
GND
EXT.
Alarm 4
Reserved Reserved
Table 18: External alarm signal definition
These signals are defined as “TTL/CMOS level”, for RU, the following voltage are valid as EXT_ALM
signals:
Voltage as applied to EXT Alarm pin
Alarm condition
0V to 1.5V
Alarm recognized
3.5V to 5V
No Alarm recognized
Table 19: Voltage applied to EXT_ALM pin
3.5.8 INTEGRATED MODEM CONNECTON
Wireless Modem
For the equipment variant equipped with the wireless modem, it is the wireless modem integrated in
the MU provides the option of remote connection of the equipment by OMT. The wireless modem
implements the link for data and SMS. The power cable and data wire has already been connected to
the wireless modem, customer only need to insert the SIM card into the SIM card slot.
