Vodavi STARPLUS Triad XTS, Installation Manual

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Peripheral Cards and Components 4-11
Chapter 4 - Maintenance and Troubleshooting
Miscellaneous Functions
The following units are related to other system functions that are external to the KSU.
The Ring Generator Unit (RGU) provides ringing voltages for Single Line Telephones. Each
Cabinet supporting SLTs must have an RGU installed.
The Power Failure Transfer Unit (PFTU) provides automatic cut-over of up to 6 CO lines to up to
6 Single Line Telephones when system power or the central processor fails.
Station Card Functions
The system can be equipped with various types of station interface cards.
The digital key telephone interface board (DTIB) provides the interface for twelve Digital
Telephones, DSS/BLF Consoles.
Table 4-13: Ring Generator Unit (RGU)
Problem Possible Solutions
Single Line Telephones do not ring
when called on intercom … Check RGU connection.
Message Waiting signal to Single
Line Telephones with message
waiting lamps does not light lamp … Verify correct SLT type programmed (SLT with
Msg Lamp in Station ID programming).
Table 4-14: Power Failure Transfer Unit (PFTU)
Problem Possible Solutions
CO lines connected through the
PFTU are never available to the
system in normal operation …
† Make sure the NORMAL/TEST switch on
the PFTU is in the Normal position.
† Check PFTU programming.
Table 4-15: Digital Key Telephone Interface Board (DTIB)
Problem Possible Solutions
Unable to receive intercom dial
tone …
† Reset the system.
† Check wiring.
Poor transmission characteristics
…
† Check wiring.
† Replace DTIB.
Key telephone set inoperative … Check station programming.
Key telephone unable to invoke
features … Check feature programming.
No LED indications … Check using known operative keyset.