1-4
The Mainframe Lexicon, Inc.
I/O Clock Card
MIDI CONNECTORS (FIVE-PIN DIN FEMALE)
• MIDI In 
Accepts MIDI data from other MIDI-equipped 
devices.
• MIDI Thru 
Retransmits, unchanged, MIDI data received at
the MIDI In connector.
• MIDI Out
Transmits MIDI data generated or modified by the
960L.
TTL WORD CLOCK (BNC)
• Input Loop
Allows the 960L to be synchronized to other 
studio equipment.
• Output
Allows studio equipment to be synchronized to 
the 960L.
Note:
The 960L can also derive Word Clock from AES
input 1-2, or generate it internally.
Remote Control Connectors  
The 960L supports up to two LARC2s. The 960L comes stan-
dard with one LARC2 — an optional second LARC2 can be
purchased separately. The 960L Remote connectors are
for use with the LARC2 controllers only.
IMPORTANT:
Never connect either Mainframe remote port to
anything other than LARC2. Doing so may dam -
age your equipment.
Option Plates 
Reserved for future use.
YOUR 960L MAY CONTAIN ANY COMBINATION OF
THE FOLLOWING CARDS:
ANALOG INPUT CARD
The 960L’s analog audio input card has eight female
XLR  connectors,  all  electronically  balanced.  For
impedances  and  signal  levels,  see  the  Pro d u c t
Specifications located in the Appendix Section of this
manual.
ANALOG OUTPUT CARD
The 960L’s analog audio output card has eight male
XLR  connectors,  all  electronically  balanced.  For
impedances  and  signal  levels,  see  the  Pro d u c t
Specifications located in the Appendix Section of this
manual.
AES I/O CARD 
The 960L’s digital audio inputs and outputs are com-
bined on one card holding four XLR two-channel
female connectors for AES input and four XLR two-
channel male connectors for AES output. 
Mains Power Switch
This  switch  turns  the  power  in  the  960L  completely 
off or on.
Mains Voltage Selector
If your 960L is equipped with a mains voltage selector
switch, before connecting the Mainframe to power mains
make sure the setting matches your local mains voltage.
Refer to the Installation guidelines on p. 1-7 for more
information.
IEC Power Connector 
Accepts IEC power cords with mains plugs specific to your
country.