Electrical installation and wiring
5-42 Chapter 5: Installation 98-127093-H
5.3.12 Wiring discretes
Discrete annunciators and Chime/Lamps Inhibit
The following drawing shows the wiring of discrete annunciators and Chime/Lamps Inhibit.
Pins for discrete annunciators
The following list shows the pins used for discrete annunciators:
Table 5-24: SBU pins for discrete annunciators
TP27 Annunciator #3 “Service available” (Discrete I/O) Output: Lamp Driver
TP28 Annunciator #1 “Incoming call” (Discrete I/O) Output: Lamp Driver
TP29 Annunciator #2 “SBU failed” (Discrete I/O) Output: Lamp Driver
BP1 Annunciator #4 “Message received” (Discrete I/O) Output: Lamp Driver
Function of discrete annunciators
The function of the annunciators is as follows:
• Annunciator #1 “Incoming call” (TP28)
Default behavior: Active (low) when a handset is ringing.
• Annunciator #2 “SBU Failed” (TP29).
Default behavior: Active (low) whenever a BITE with severity essential or fatal is active
on the SBU.
• Annunciator #3 “Service available” (TP27).
Default behavior: Active (low) when the SwiftBroadband Service is available.
• Annunciator #4 “Message received” (BP1).
Default behavior: Active (low) when a Message is received in the SBU.
Figure 5-28: Wiring discretes
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SBU pin Name and description Discrete type
a
a. The discrete interfaces are described in Description of the discrete types on page 5-44.
SB-Lite.book Page 42 Tuesday, September 5, 2017 1:38 PM
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