Instruction manual

Page 26
UTY4422-001 Page 26 of 74
2.6 EXPANSION CARD CONFIGURATION
The purpose of this section is to detail the jumper settings and labeling instructions for the Unity
Expansion Cards.
2.6.1 Balanced Audio Expansion Card
2.6.1.1 Audio Card Jumper Configuration
Jumper settings – Dotted and Non-dotted. The headers used here have 3 pins, so a jumper
connecting 2 of these pins can connect pins 1 & 2 or pins 2 & 3. The “Normal” position of this
jumper is marked by a dot on the silkscreen near either pin 1 or pin 3.
Dotted Position - Jumpering pin 2, the center pin, to the pin nearest the dot.
Non-Dotted Position - Jumpering pin 2 to the pin furthest from the dot.
Installing one audio expansion card enables audio channels 3 and 4. You should set jumpers J2,
J3, J4, J6, J7, and J8 on this Audio Card to the “dotted” position.
Installing a second audio expansion card enables audio channels 5 and 6. Set jumpers J2, J3, J4,
J6, J7, and J8 on this Audio Card to the “non-dotted” position. Leave the jumpers on the first
audio expansion card in the “dotted” position, which will continue to enable channels 3 and 4 on
that card.
Either available module slot may be used with the “non-dotted” card, but that card will be the
Channel 5 & 6 card. The “dotted” card will be the Channel 3 & 4 card. Each card should also
be labeled appropriately. (See the following section.)
2.6.1.2 Audio Card Label Instructions
When a single balanced audio expansion card is installed (In either Module 1 or Module 2 slot),
channels 3 and 4 are used. You should set the jumpers on that card to the “dotted” position, and
label the Audio Card Bracket as [CH4 CH3]. To label it:
1. Peel the [CH4 CH3] label from the backing.
2. Press the label onto the rear of the Audio Card Bracket, within the blank rectangle
provided, or cover existing silkscreen text.
* * * Caution! * * *
When 2 audio expansion cards are installed, one must have the jumpers in
the dotted position, and the other must have them in the non-dotted position.
Failure to correctly configure the jumpers WILL cause operational problems.