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Appendix F - Explanation Of Start Up Sequence And Front Panel Lights
Once the unit is powered on, it goes through a start up sequence. The power light comes on, the channel lights are
individually pulsed, the relays are pulsed, and the firmware version of the channel microprocessors is sent. This
process takes approximately 5 seconds and thereafter, the unit is operational and is ready to monitor calls.
The unit is shipped from the factory set to detect On and Off Hook by sensing the telephone line voltage (refer to
Appendix B, page 16, for more information). Internal jumpers (shunts) can be set to sense On and Off Hook via
current flow through the unit. Channel lights will operate differently for voltage and current detect modes
VOLTAGE DETECTION MODE
(Normal Factory Default)
A solid channel light indicates that a live phone line is attached and is On Hook. A channel light that goes out and
pulses once every second indicates either an Off Hook condition on that line or a live phone line is not attached
The following discussion assumes a live phone line attached to a channel. When a phone goes Off Hook the
channel light goes off and pulses every second . The light will come on during every touch tones dialed. When the
phone goes back On Hook the channel light will return to solid on. On inbound calls, the channel light will follow
the ring pattern on the line. When the ring signal is present the light will be on. Between rings, the light will go off.
Also, when the Caller ID signal is sent between the first and second rings, the light will pulse momentarily
CURRENT DETECTION MODE
(When Internal Jumpers are Reconfigured to sense loop current)
Channel lights will remain on except when a live line is attached and is On Hook. When a live line goes Off Hook
the channel light will goes off and pulse every second. As with the voltage detection mode, the light will come on
during every touch-tone dialed. When the phone goes back On Hook the channel light will return to solid on. On
inbound calls, the channel light will follow the ring pattern on the line. When the ring signal is present the light will
be on. Between rings, the light will go off. Also, when the Caller ID signal is sent between the first and second
rings, the light will pulse momentarily
