Oxmoor MCS - Manual (Page 8)

Page 6
MCS-LI LINE INPUT CARD
(Callouts refer to Figure 1.4)
One MCS-LI Line Input card is required for
each room to be combined. A total of eight Line
Input cards can be used with each MCS-
MAINFRAME.
1. AUDIO INPUT - Electronically balanced
input, accepts balanced or unbalanced
signals from line-level devices. Normal
input level is 0 dBu with a maximum input
level of +24 dBu.
NOT SHOWN: A trim pot, accessible from the
front panel, may be used for audio input level
adjustment.
A typical system has an audio source
located in each room. Each room’s audio
source connects to the IN on the
appropriate MCS-LI Line Input Card.
2. AUDIO OUTPUT - Electronically balanced
output, accommodates balanced or
unbalanced lines. Recommended Load
Impedance is 600 ohms or greater.
Maximum output level is +24 dBu.
The Audio OUT connects to an amplifier
driving speakers located in the room where
the source (Audio IN of the MCS-LI) is
located.
3. REMOTE VOLUME - Provides for
connection of Oxmoor’s RC-16 and/or RC-
2 Remote Volume Controls.
The volume control(s) would normally be
located in the room where the audio source
is located.
4. TALLY - LOCAL SELECT and MUSIC
SELECT TALLY connections. A typical
room panel would have LEDs on or next to
the LOCAL and MUSIC select switches. The
TALLY connections provide a path to
common through open-collector transistors
to turn the appropriate LED on when either
LOCAL or MUSIC is selected.
5. LOCAL SELECT and MUSIC SELECT -
Provide connections for the LOCAL and
MCS-LI LINE INPUT CARD
MUSIC buttons. These momentary push-buttons are
normally located in the zone associated with the
MCS-LI’s audio source. The user may select
between LOCAL (source connected to the audio
“IN” of the MCS-LI Line Input card) and MUSIC
(source connected to the “MUSIC IN” on the MCS-
LC Logic Card).
NOTE: The MCS-RP Room Panel incorporates the functions
described in 3, 4 and 5 above.
6. MUTE - Each momentary contact closure between
the MUTE terminal and COM "toggles" the audio
output on and off.
Figure 1.4: MCS-LI Line Input Card
MCS-L I
CU
DISP
IN +
IN –
SHIELD
OUT +
OUT -
SHIELD
COM
CD
LOCAL TALLY
MUSIC TALLY
LOCAL SELECT
MUSIC SELECT
MUTE
1
2
6
3
5
4