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3.3 7870 Interfacility Link Pinouts
page 20 Document no. 93-005-35-C5
3.3 7870 Interfacility Link Pinouts
3.3.1 Transmitter Pinout
Note
If a 2380 Relay Adapter is installed RF and Optical Levels are measured
together; the alarm indicates a problem in either the RF or Optical Levels.
Figure 15 7870T Transmitter pinout
Standalone
9-Pin
Connector
[J13]
7180M
Chassis
Backplane
Connector
2380 Relay
Adapter
Connector
Name Description
1 — — +14V Power
200 mA [max ≥ 10°C]
1
2— — Spare
Not Used
3 J11-P9, J12-P25
J13-P25
J4-P25 GND
Chassis Ground
4 J13-P1 to J13-P8 J4-P1 to J4-P8 RSSI
RF signal strength indicator:
range 0.2 - 10 V
5
J13-P9 to
J13-P16
J4-P9 to J4-P16 PDI
Indicates laser optical power:
range -4.2 to 4.8
6 J13-P17 to
J13-P24
J4-P17 to J4-P24
LSRI
Indicates Laser Bias;
Range
7 J12-P1 to J12-P8
J2: P1-P2
P3-P4, P5-P6
P7-P8, P9-P10
P11-P12, P13-
P14
P15-P16
RFA
RF Alarm: Open collector
interface.
2
Sinks current when
RF level is low, up to 30 mA.
8J12-P9 to
J12-P16
See note below OPTA
Optical Alarm: Open Collector
Interface
2.
. Sinks current at low
optical, up to 30 mA.
9 J11-P1 to J11-P6 Spare
Not used
Table 4 7870T Transmitter Pinout
1. 300 ma below 10°C
2. If the 2380 Relay Adapter is installed, the alarms are dry contact. See Appendix 3 The 2380
Relay Adapter on page 33.