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STAC
What are you talking about?

 

NAB was talking about STAC!

It took home both the

Radio Magazine Pick Hit Award

and the

Radio World Cool Stuff Award


Home TechNotes PDF Format Brochure

What are you talking about?


A call-in on local politics.
An interview with the winning quarterback from his hotel.
An eyewitness with late-breaking news.
A dedication to the one someone loves.
Congratulating caller number six on winning concert tickets.


The telephone has always been essential to live broadcast. Studio Telephone Access Center (STAC) puts you in control of your talk shows, call-ins and phoners with great sound, ease of operation and scalable configuration.

STAC incorporates a pair of Comrex high-performance digital hybrids with automatic audio level control. The result is the most natural sounding telephone audio, even when conferencing multiple callers. A compact, rack-mounting mainframe houses the hybrids, the multiline controller and all telephone and audio connections.

The attractive, ergonomic control surfaces offer two operational modes, selectable with a flip of a switch:

  • Studio/Producer Mode provides both pre-air and on-air caller management.

  • Screener Mode simplifies the task of screening and queuing callers.
Powerful call management can be quickly mastered with minimal training. A single control surface is included for basic operation. For more demanding programming, up to four control surfaces may be used.

Call screening and control are available from any networked computer, using a standard web browser, with the included STAC IP. With STAC IP, your talent can host their shows from anywhere there is an Internet connection or you can economically create more control points from any computer on your local network. No additional computer is needed to serve the STAC IP webpage, as it is served from the mainframe. Your connections are secured by password protection and no dedicated client software needs to be installed. In addition to replicating the call status information on the control surfaces, STAC IP also provides fields for additional information about callers and text “chat” among those on your show network.

We have implemented a demo of the STAC IP. This link is to an actual working STAC system at our facility in Massachusetts, USA. The firmware is in a "beta" state at this time and improvements are ongoing. The demo works best via Internet Explorer with any pop-up blockers disabled. The username can be anything you like but the password is comrex (lowercase) Alt-F4 will exit the full screen mode. For a demo of the STAC IP, click here.

Innovative features include an Auto Attendant that automatically answers incoming callers with your custom message and puts them on hold; dedicated control surface buttons to designate the next caller to be placed on air and to activate an external recorder or delay; and program-on-hold audio.

The STAC12 mainframe and control surface are configured for 12 phone lines, while the STAC6 is configured for six lines. Expanding a STAC6 to a STAC12 in the field is quickly accomplished by installing a mainframe extension card and control surface “sidecars”.

No matter what you’re talking about, you’ll be talking about quality, convenience and value when you put the Comrex STAC on the line.

 


12 Line Mainframe with Control Surface

 

 


Six Line Control Surface

 

Rear View of Six Line Control Surface

 

 



Mainframe Front View

 

 

Mainframe Back View

 

Key STAC Features


STAC Mainframe

STAC 12 with Control Surface

STAC Mainframe Front View

STAC Mainframe Rear View


STAC Control Surfaces

Side View

6 Line Control Surface

Rear View

 


STAC IP


• Duplicates control surface functions on any network-connected computer using standard web browsers.

• Password protected access to talent, producers and screeners on existing local networks and Internet connections.

• Software is served from STAC mainframe, so no dedicated server is required.

• Call timers are displayed for each line, showing length of time on hold
and length of time on air.

For a demo of the STAC IP, click here. The demo works best via Internet Explorer with any pop-up blockers disabled. Alt-F4 will exit the full screen mode.

 

SPECIFICATIONS

STAC Mainframe

Rear panel connections

• Send input—XLR female: 0 dBu nominal, adjustable,
balanced, bridging, 20 kO impedance

• Caller 1 and 2 outputs—XLR male: 0 dBu nominal,
adjustable, balanced, 50 O impedance

• Telco lines—Two x RJ-45 connectors per six phone lines:
POTS (plain old telephone service) line, analog extension
from a PBX or dry line (no DC offset voltage)

• Auto-disconnect—Disconnects on loop drop or loop
reversal. User selectable.

• Key service compatibility—Any key system providing
true tip and ring compatibility to telephone instruments

• Tip/ring switching—Solid state relay

• Loop-through to PBX—Two x RJ45 per six phone lines

• Hybrid expansion port—RJ-45

• Control surface—Four x RJ-45

• Network connection—10Base-T Ethernet

Hybrid Performance

• Telephone transmit
  • Nominal send input: 0dBu referenced to -15 dBu onto the telephone line
  • Frequency response: 250 Hz to 3.5 kHz, ±1 dB
  • Signal-to-noise ratio: >56 dB
  • Distortion: <0.2%

• Telephone receive

• Nominal telephone line level: -15 dBu referenced to caller output of 0 dBu
• Frequency response: 250 Hz to 3.5 kHz, ±1 dB
• Signal-to-noise ratio: >56 dB
• Distortion: <0.2

• Null

• Send-to-caller separation: 55dB nominal
• Tail time: 32 milliseconds

• Mix-Minus

• Caller-to-send separation: 50 dB nominal
• Tail time: 32 milliseconds

Power and physical


• Internal supply: Auto Adjusting 100/240 VAC 50/60 Hz

• Dimensions: 19" W x 11.5" D x 3.5" H (48.26cm x 29.21cm x 8.89 cm)

• Weight: 12.5 lb (5.75 kg)

STAC Configuration

• STAC12 Complete System includes mainframe for 12 phone lines and one 12-line STAC control surface

• STAC6 Complete System includes mainframe for six phone lines and one six-line STAC control surface

• Additional items:

• Extra control surfaces are available with either 12 or 6 lines
• STAC6 to STAC12 mainframe upgrade includes
field-installable plug-in circuit board
• Sidecar Upgrade increases the number of lines managed by a control surface from 6to 12

 

STAC Control Surface
Rear panel dip switch adjustments

• Selection of control surface mode: Screener or Studio/Producer
• Aux mode selection: Momentary or toggling
• Aux/Next button mode assignment
• Handset level boost
• Headset mode selection

Rear panel connections

• Headset jacks–Two stereo mini-jacks
• Aux control output—DB-9: Selectable as momentary or latching signal


Powered by STAC Mainframe

Physical
• Control Surface for STAC6

• Size:10" W x 7" D x 3.25" H (25.4 cm x 17.78 cm x 8.25 cm)

• Weight: 2.2 lbs/ 1 kg

• Control Surface for STAC12

• Size: 16.5" W x 7" D x 3.25" H (41.91 cm x 17.78 cm x 8.25 cm)

• Weight: 3 lbs (1.4 kg)

 

© Copyright 2003 Comrex Corporation  All Rights Reserved.