C
OMREX
C
ORPORATION
14
STAC Product Manual
15
STAC is delivered with one control surface. Four ports are present on the
STAC mainframe, so up to four control surfaces may be used. Additional
control surfaces are available from Comrex. Each control surface contains
one telephone handset, useful for screening or dialing calls. The control
surfaces require Cat-4 (or better) wiring with Ethernet style pinning, using
all four pair on the RJ-45 cable. Avoid underpinned and cross-over cables.
The control surfaces are powered over this cable and can be extended to
100 feet.
Before setting up a control surface for use with STAC, you must determine
whether the surface will be used as a
Screener
or a
Studio
surface. The ma-
jor differences are listed below:
1) Only
Studio
control surfaces can put calls
On Air
.
2) Only
Studio
control surfaces provide indication of which hybrid is
being used for each call.
3)
Studio
control surfaces share a single button for
Answer
and
On
Hold
.
4)
Screener
surfaces have separate buttons for
Answer
and
On Hold
.
5)
Studio
and
Screener
surfaces have different color lights to indicate
the various states of each phone line.
If you plan on using only one control surface (without STAC IP), you must
configure the surface for
Studio
, since this will be the only way to put calls
On Air
.
Studio
surfaces can perform all functions of
Screener
surfaces.
S
ECTION
3
C
ONTROL
S
URFACE
D
IAGRAMS
AND
I
NSTALLATION
B
ASICS
