Speck Electronics SSM - Manual (Page 22)

Chapter 3 Installation Section
Interfacing Expanders The Model SSM has been prewired with a multipin pin connector to
accept any of the SSM series of Expanders. SSM Expanders are
available in two versions: The SSMEX-32, 16 stereo channels; and the
SSMEX-16, 16 mono channels.
The Expander is connected to the main mixer with a special 6 foot
shielded multiconductor interface cable that utilizes 38 pin Elco
connectors at each end. The Expander does not require an additional
power supply, as it receives its power when connected to the main
mixer.
The Expander is considered an extension of the main mixer and is not
intended to be remotely mounted. It was designed to be installed
directly above or below the main unit and should follow the same
installation guidelines as described for the main unit.
Due to the mounting proximity requirements of the Expander, the length
of the interface cable has been limited to 6 feet. No attempt should be
made to modify or extend this cable. Any attempt to modify or extend
this cable could result in extreme noise, oscillation, hum or buzzes, or
total failure of the Model SSM.
Before connecting the SSM Expander to the SSM main unit it is
important that the power supply be turned off.
To attach the interface cable, gently fit the 38 pin Elco connector into
the main mixers receptacle and turn the actuator screw clockwise. The
connector and receptacle are keyed so they can only fit in one direction.
If any resistance is met when installing the connector, reverse the
actuator screw, remove the connector, inspect for any obstruction and
try again. Install the other connector end into the Expander in the same
manner.
If there is an excess amount of interface cable remaining after the units
have been connected, it should be bundled neatly with a cable tie. It is
important that the interface cable be kept away from sources of EMI and
RFI. These EMI sources include power supplies, power amplifiers, or
any power creating device that could cause undesirable buzzes or hums
in the mixer system.
Mounting location
17
Installing the Interface Cable