Vertical Communications DSU and DSU II manual Understanding The Data Button Light

Using The Other Telephone Features GCA70–245

8.22 Understanding The DATA Button Light

The optional Data Interface Unit (DIU) provides connections for your standard multiline digital telephone and an Industry Standard Telephone (IST) device. The DIU enables you to switch between your multiline telephone and an IST device (an industry standard telephone, FAX machine, modem, cordless telephone, or answering machine).

When you have DIU (either local or remote) assigned to your multiline telephone, your telephone will have a preprogrammed DATA button labeled DATA by the system installer. The DATA LED will provide you with the following visual feedback on the operating status of the DIU.

DATA LED	DIU STATUS
Off	Digital mode (multiline telephone selected)
On (green)	IST device selected but not active
On (red)	IST device busy
Flashing (red)	IST device ringing

If the DIU has been removed or is inoperable, the DATA LED will be off. If this occurs, plug the multiline telephone into a digital station port.

∙To select the multiline telephone (DATA LED on or flashing),

1.Press the preprogrammed DATA button. If a call is in progress on the IST device, it will transfer to the multiline telephone if the multiline telephone is off hook or in speakerphone operation. If the multiline telephone is on hook, the call will be dropped.

∙To select the IST device (DATA LED off),

1.Press the preprogrammed DATA button. If a call is in progress on the multiline telephone, it will transfer to the IST device if that device is off hook. If the IST device is on hook, the call will be dropped. You can still receive visual messages via the LEDs and LCD on your multiline telephone, even though the voice path is routed to the IST device.

NOTE: If you transfer a line to your own multiline telephone then press the DATA button, the IST device will ring.

8–22 LCD Speakerphone Reference Manual