NE1000 CATV Optical Transmitter Operation and Maintenance Guide
power surges.
4. MONITOR/DATA Port - A 15 Pin D-SUB connector port for monitoring and
controlling the transmitter from a remote status monitoring system. The pin
definitions and functions of the D-SUB connector are shown in Table 1.
5. SELECTION Dip Switches – For setting locally defined functions. See Figure 2
and Table 2 for dip switch functions and settings.
6. RF INPUT – 75Ω F-type port
7. OPTICAL OUTPUT – An FC/APC port for fiber connection. (As an option the
port can be configured for SC/APC.) Do not look into this port when laser is
operating. The laser can cause serious eye damage.
Pin Function
1 Ground
2
Laser temperature monitor. 1V of output voltage is equivalent to 10°C.
3 Laser bias current monitor. 1V of output voltage is equivalent to 10 mA.
4 Laser output power status. 1V of output voltage is equivalent to 10 mW.
5 Average RF signal power status
6 Internal power supply voltage monitor. 1V of pin output voltage is equivalent
to 6 volts of power supply voltage. The normal pin voltage is 2V.
7 Status Monitoring (STM) control signal input. The pin is used when
interconnecting a Status Monitoring System.
8 Laser control input. A TTL high input turns the laser off. A TTL low input turns
the laser off.
9 RF gain mode control. A TTL high input sets the transmitter to AGC mode. A
TTL low input sets the transmitter to the MGC mode.
10~15 Not Used
Table 1. Monitor/Data port connector pin functions
6
1 2 3 4 5 6 7 8
0
