May 2001System Hardware Manual 7 - 225A6-324000-642-01 – Release 4.0May 20013.6.3 Switch SettingsThe HFU-UA (WH) Unit uses two-position switches SW1and SW2.The following table lists the SW1 and SW2 switch settings.3.7 PCT( )-U13 Unit (PC Telephony Board)The NEC PC Board is a multifunction PC-AT add-in card withtelephone, sound system, fax, and modem abilities and combinesmultimedia audio, Telephone Application Programming Interface(TAPI), and a 33.6K fax/data modem. The board is available with/without the built-in modem.The PC Board replaces an NEC desk set as the primary telephonedevice; the telephone line from the wall now plugs directly into thePC board instead of the desk set. The desk set can be connected tothe PC board and used as an adjunct or auxiliary telephone. Anexternal microphone and external speakers can also be connectedto the PC BoardThe PC Board allows telephone operations with a headset ormicrophone and has the following audio abilities:Figure 7-53 HFU-UA (WH) Unit SwitchesTable 7-4 HFU-UA (WH) Unit Switch SettingsSW1 SW2Position1Position2Position1Position2 DescriptionOFF ON OFF ON Full Duplex (Default)ON OFF OFF ON Half Duplex (6db mix ratio)OFF ON ON OFF Half Duplex (12db mix ratio)ON OFF ON OFF Half Duplex (18db mix ratio)Notes:Full Duplex: In some large areas or noisy locations half duplex should beused. There are limits to the echo cancelling ability of the HFU-UA.Half Duplex: If voice clipping occurs, use a lower decibel setting.
