Studio Technologies M212-00151 - Manual (Page 26)

Issue 2, June 2006 Model 212 User Guide
Page 27 Studio Technologies, Inc.
comfortable headphone output level. This
will allow the user, in response to their
preference or a changing environment,
to adjust the level and balance controls
as desired. The detent positions will al-
ways remain as a useful reference point.
To achieve this condition the audio level
on the connected sources must be ad-
justed as required. Spending a few extra
minutes “trimming” the connected audio
signals, rather than just providing what-
ever happens to come up, should prove
worthwhile. The result will be talent that is
more relaxed, and an overall production
that works more smoothly.
Technical Notes
Model 44 Interface
Some applications may benefit from us-
ing the Model 44 Interface which is also
available from Studio Technologies. The
single-rack-space unit provides operat-
ing power and digital audio interconnec-
tion for up to six Model 212 Announcer’s
Consoles. Each Model 212 interconnects
with an RJ45 port on the Model 44 using a
single 4-pair “CAT5” or “CAT6” Ethernet-
style cable. One pair of the twisted-pair
cable supplies 24 volts DC to the Model
212. Two additional pairs transport digital
audio to and from the Model 212’s AES3
interface. A fourth pair is available for
installer-specified functions. Details about
the Model 44 are available on the Studio
Technologies website.
The EtherCon® Connector Card Kit
(Studio Technologies, Inc. part number
31207) offers a simple means of preparing
a Model 212 for use with a Model 44
Interface and Ethernet-style interface
cables. This optional card kit is intended
to be mounted in one of the two spare
connector openings located on the Model
212’s back panel. It’s recommended that,
when viewed from the back, the EtherCon
kit be mounted on the left side with the
metal locking tab facing to the left.
Three jumper cable assemblies, provided
with the EtherCon kit, are used to link the
Model 212 with the appropriate pairs on
the EtherCon connector. The Model 212’s
AES3 output is accessible on 3-pin header
P8 and should be connected to 3-pin
header P14 on the EtherCon kit’s printed
circuit board. The Model 212’s AES3 input
is accessible on header P9 and should be
connected to header P15 on the EtherCon
kit’s printed circuit board. The Model 212’s
power input is accessible using header
P10 and should be connected to header
P13 on the EtherCon kit’s printed circuit
board.
Once this has been completed standard
computer-style patch cables can be used
to link the Model 212 with a port on the
Model 44 Interface. These cables, often
called “CAT5” patch cables, are “straight
through” and organize their four twisted
pairs as pins 1 and 2, pins 3 and 6, pins 4
and 5, and pins 7 and 8. For reference the
EtherCon Connector Card Kit implements
this interconnection scheme: pins 1 and 2
carry digital audio to the Model 44, pins 3
and 6 bring digital audio from the Model
44 to the Model 212, and pins 7 and 8
bring 24 volt DC power from the Model 44
to the Model 212. The power is polarity
sensitive with positive on pin 7 and nega-
tive on pin 8.
Phantom Power
The Model 212 provides a 48 volt nominal
source of “phantom power” to support
condenser-type microphones. It’s de-
signed to meet the P48 requirements