Toshiba DK 16, DK8 manual Data Interface Unit Installation, General

INSTALLATION-PERIPHERALS

SECTION 100-816-207

MARCH 1993

10DATA INTERFACE UNIT INSTALLATION

10.00General

10.01STRATA DK8 and DK16 support two types of Data Interface Units (DIUs) that enable digital tele- phone users to simultaneously transmit and re- ceive data on the same digital station port and wire pair while communicating on a voice call. One unit, called the integrated DIU (PDIU-DI/PDIU-DI2), becomes part of the digital telephone, replacing the telephone’s base; the other unit, is a small self- contained unit called the stand-alone DIU (PDIU- DS). Each DIU is powered by the digital port it is connected (see Table 8-D for wiring requirements).

NOTES:

1.“Digital Ports” includes the DK8 KSU, DK16 Base Unit, PDKU and KCDU digital sta- tion ports. This applies wherever the term “Digital Ports” is used in the text and figures in this chapter.

2.2000-series digital telephones require PDIU-DI2 and 1000-series telephones re- quire PDIU-DI.

10.02Both DIUs can be connected to standard Electronic Industries Association (EIA) RS-232 asynchronous serial data devices. EIA devices are divided into two categories: data communication equipment (DCE) and data terminal equipment (DTE). Common DCE devices are modems and some printers; common DTE devices are personal computers, ASCII terminals, and some printers. The PDIU-DI operates like a DCE and connects directly to DTE devices using standard RS-232 cables. Depending on how its internal jumper plugs are configured, the PDIU-DS can either operate like a DTE and connect to DCE devices; or operate like a DCE device and connect to a DTE device. In most applications, DTE and DCE devices exchange data between each other via the standard RS-232 cable connection.

10.03DIUs can function with DCE and DTE de- vices at data speeds of up to 19.2 kbps. However, keyboard dialing using AT commands (from a PC

or terminal connected to a DIU) is limited to 9600 bps. A speed of 19.2 kbps can be achieved when dialing from a PDIU-DI-equipped digital telephone dialpad, but many PC software programs do not yet handle 19.2 kbps in an error-free manner. Also for a 19.2 Kbps operation the computer or terminal’s “COM” port must be specified to function at 19.2 Kbps. Some computer “COM” ports, like those used in older IBM XT type computers, will not operate at 19.2 without errors. DIU data transmis- sion speed is set by the first AT command that the DIU receives once it is in the command state; if manual dialing or receiving calls in the auto answer (default) mode, the transmission speed is transpar- ent.

IMPORTANT NOTE!

To use the PDIU-DI or PDIU-DS with AT commands, communications software or a PC program that performs terminal emu- lation must be used. AT commands cannot be issued from the computer’s operating system prompt.

10.10Common DIU Connections

10.11The block diagram in Figure 7-24 illustrates common DIU connections. In this example, PDIU- DIs are connected to personal computers (PC1 and PC2), and PDIU-DSs are connected to a serial printer and modems. The personal computer users can transfer files internally, print files on the same printer, and access the modem pool to send/re- ceive data to/from an external personal computer or dial up data service.

10.12To access these devices, a data call connec- tion must be established between the DIUs. This is accomplished by dialing the destination DIU from a digital telephone dialpad or from a PC keyboard using standard AT dial commands. PDIU-DIs share the same intercom numbers/ports with the digital telephone to which they are connected, while PDIU- DSs have their own. The Intercom and Data Call LEDs on the digital telephone tell the system whether a voice or data call is being made: the Intercom LED, voice calls; and the Data Call LED initiates data calls. When dialing from a keyboard with AT commands, AÊ T Dis typed for voice calls, and A T D D for data calls.

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