6.2.1SPECIAL CONCERNS ABOUT CONNECTING AUDIO DEVICES TO THE KVM/SERIAL/AUDIO
MICRO EXTENDER
Before you connect any sound equipment to the KVM/Serial/Audio Micro Extender, here are some things you should keep in mind:
The Extender’s audio interface is stereo, bidirectional (sound can be transmitted in both directions across the link at the same time), and line-level (it supports devices that transmit and receive at up to 5 volts peak-to-peak). In the output (“line out”) direction, it’s designed to take the output from a computer’s sound card or other line-level source and send it to a set of powered speakers at the remote site. In the input (“line in”) direction, it’s designed to take input from a microphone at the remote site and send it to a local sound card or other line-level destination. It can also send signals in the opposite directions (for example, sound from a remote source to local speakers, or from a local microphone to a remote recorder), although a local microphone would have to be self-amplified and would have to output signals at line level. The Extender’s audio connectors are labeled on the top of each Unit’s case with a speaker icon and the words “Out” (above the audio- out port) and “In” (above the audio-in port).
•To attach headphones or powered speakers: Plug the headphones or speakers directly into the Local or Remote Unit’s audio-out connector. Run a standard 3.5-mm mini stereo audio cable such as product code EJ110-0010 from the audio-in connector of the Remote or Local Unit at the other end of the link to the “LINE OUT” connector of a PC or sound card—colored lime (yellow- green) in the PC99 specifications, but often colored differently—or of a CD player or other audio source.
•To attach a microphone that the sound card will be amplifying (the preferred type of microphone attachment): Plug the microphone directly into the Remote Unit’s audio-in connector. Run a standard 3.5-mm mini stereo audio cable such as product code EJ110-0010 from the Local Unit’s audio-out connector to the sound card’s “MIC” (“microphone in”) connector (colored pink in the PC99 specifications, but often colored differently).
To attach a self-amplified microphone, CD player, etc.: Plug the device directly into the Local or Remote Unit’s audio-in connector. Run an audio cable such as EJ110-0010 from the audio-out connector of the Remote or Local Unit at the other end of the link to the “LINE IN” connector of a PC’s sound card—colored light blue in the PC99 specifications—or of a tape recorder or other audio destination.
To attach a microphone that the Extender will have to amplify itself: Set the Extender’s MIC jumper as described in Section 5.3. Plug the microphone directly into the Remote Unit’s audio-in connector. Run an audio cable such as EJ110-0010 from the Local Unit’s audio-out connector to the sound card’s “LINE IN” connector (colored light blue in the PC99 specifications).
