Handbook

Table Of Contents
Redbox User Handbook No 3
59
GENERAL INTERFACES - RB-LC3
GENERAL INTERFACES
10
Switched Mains Outputs
The 3 o IEC connectors provide the switched mains outputs. Each output is rated at 1A and
is individually fused. A neon indicator shows when the output is live. The outputs are driven
by zero cross-point drivers. When an output is activated, the A.C. voltage level at that output
will be equal to the mains input voltage used to power the unit.
Telephone Connections
The telephone connections are wired pin to pin from Line to Handset except when the
Ring Mute control input is asserted. In this case the ring signal to the Handset is muted. The
status of the telephone Line is continually monitored so that Handset ringing and o-hook
conditions can be indicated.
Remote External Control Inputs
The 15 way D-type connector provides the control inputs that switch the three mains
outputs and control the telephone handset ring mute. All inputs have both active high (+5V
to +30V) and active low (0V) control. An output-on or Tally indication for each output is
also provided on this connector in the form of three open-collector driven outputs capable
of sinking 20mA each. The connections are as follows:
Pin 1: Remote 1 (Active High)
Pin 2: Remote 1 (Active Low)
Pin 3: Remote 2 (Active High)
Pin 4: Remote 2 (Active Low)
Pin 5: Remote 3 (Active High)
Pin 6: Remote 3 (Active Low)
Pin 7: Ring Mute (Active High)
Pin 8: Ring Mute (Active Low)
Pin 9: Output 1 Tally (Open Collector)
Pin 10: Output 2 Tally (Open Collector)
Pin 11: Output 3 Tally (Open Collector)
Pin 12: No Connection
Pin 13: No Connection
Pin 14: 0V
Pin 15: 0V