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PCHEU Installation Instructions

Introduction

The PCHEU is an additional option for the Toshiba DKT digital telephone. In general the PCHEU mounting location and method is the same as the HHEU and the PCHEU can be thought of as an HHEU with extended features for use with a PC computer. These enhancements over the standard HHEU include external audio channels and an automatic force 'off hook' control. The PCHEU provides the capability to record and playback calls, provide announce features, messaging, and off hook functionality when used with computer control.

PCHEU Application

The typical application of the PCHEU is to enhance the DKT telephone in three ways. First, headset connection capability is added. Second, audio record/playback channels for a PC computer sound card (or another audio device) are available. Third, additional DKT phone control is provided. This capability allows a PC to pick up a call (force 'off hook') if required even when the handset is 'on hook'. This force 'off hook' feature can be enabled or disabled by the W1 Jumper as required by the application.

W1 Jumper Setting Application Examples

To enable the force 'off hook' feature the W1 Jumper of the PCHEU needs to be installed (default setting). To disable this feature the W1 Jumper should be clipped from the board. For example, if audio recording is required but no PC control of the DKT phone is anticipated then the W1 Jumper would be removed so that the phone functions in the normal mode. Check for the intended operation before clipping the jumper. The following table should help you classify your application. If you are unsure of the proper W1 Jumper setting contact your application consultant.

W1 Jumper Setting	Phone Use	Application
Installed	Modified (speakerphone)	The telephone is used in an unattached computer controlled application where the computer is responsible for answering calls.
Removed	Modified (handset placement)	The telephone user makes heavy use of the speakerphone, is at the desk most of the time, and hardly ever expects the computer to pick up calls. For example, a lawyer may fit this application category.
Installed	Modified (speakerphone)	The telephone user is both at the desk with moderate speakerphone use and away from the office for longer periods. The computer is expected to pick up calls whenever the user is away from the desk. For example, a salesperson may fit this application category.
Removed	Normal	The PCHEU is only used to gain access to the telephone audio and the telephone is never computer controlled.
Installed	Modified (speakerphone)	The telephone user makes extensive use of a headset and very seldom makes use of the speakerphone. The computer may be required to pick up calls. Recorded customer authorizations may occur. For example, telemarketing may fit this application category.
Removed	Normal	The telephone user makes extensive use of a headset, may use the speakerphone, never expects the computer to pick up calls and recorded customer authorizations may occur. For example, telebanking or telemarketing may fit this application category.

DKT Telephone Operation Differences while using the PCHEU

When the W1 Jumper is installed and the PCHEU forces 'off hook' on an incoming call the speakerphone has to be used in an alternative way. Since the DKT telephone immediately goes 'off hook' when an incoming call arrives, pressing the speaker button cannot be used to answer the call and go into speakerphone mode as the call was already answered. If you wish to use the speakerphone in this mode you must; (1) pick up the handset, (2) push the speaker button down and hold it depressed while the handset is returned to the handset cradle. The DKT telephone will now be in speakerphone mode.

When the W1 Jumper is removed the DKT telephone functions normally. In this mode of operation it must be remembered that there is no way of forcing 'off hook' and therefore the handset must be left off hook if a computer application has to answer the call.

Speakerphone Call Recording

Speakerphone calls cannot be recorded as the telephone audio signals are not routed to the PCHEU while in speakerphone mode. If recording a speakerphone call is needed, this can be done via special control software. Contact your application consultant.

PCHEU Installation

1) Remove the DKT telephone base by loosening the four captive screws. Remove the plastic tab knockout on the telephone base using a screwdriver or other suitable flat tool. This plastic tab covers the opening that the PCHEU headset modular connector will be inserted into while installing the PCHEU board. Remove the handset hanger knockout and store it inside the base on the post near the knockout for future possible use if this is a desktop application. The created opening will provide an exit for the audio cable.

2) The audio cable (4-circuit connector at one end - two 3.5 mm plugs at the other end) feeds out of the base at the wall mount handset hook knockout. Feed the 4-circuit connector through the knockout hole and connect it to the 4 pin connector (P2) on the upper end of the PCHEU. Dress the wire out of the opening and through the wide wire channel toward the back of the base. Mount the PCHEU in the phone case base with 2 self-tapping screws provided.

3) Locate the wire jumper for the HHEU option. This jumper is typically located near the speaker base (magnet). Being careful not to cut other wires that sometimes route near this location cut the wire jumper for the HHEU option.

4) Connect the 12-circuit connector to the HHEU Option Connector on the main phone circuit board. This connector is located on the cable that is connected to the 9-pin connector P1.

5) Dress wires so that they clear obstructions and are not pinched while reinstalling the base to the main phone body.

6) Connect the audio 3.5mm plugs to the PC sound card. The green color keyed plug connects to LINE OUT (or if not available, SPEAKER OUT). The black color keyed plug connects to LINE IN (or if not available , MIC IN).

7) Check and adjust for proper audio levels with the appropriate PC multimedia controls. Please remember these audio levels are key to obtaining the best quality recordings.

Rev. 2 2/28/99