Clear-com TW-12C Intercom System Isolation
Interface
Clear-com TW-12C completely eliminates hums and
buzzes caused by ground loops. The
TW-12C compensates not only for level
differences between systems, but for varying
impedances caused by
transformers and capacitance on the lines. The TW-12C provides
an
electrically isolated interface between the two intercom systems. Either
“side” of the
interface can connect to a Clear-Com intercom system or an
RTS intercom system, allowing
Clear-Com- to-Clear-Com, Clear-Com-to-RTS,
and RTS-to-RTS combinations. In addition, the
TW-12C passes through and
translates “call” signals, Clear-Com-to-RTS and vice versa.
The
interface consists of two identical, 2-wire-to-4-wire hybrid networks which
break the
ground loops that occur when two systems are run from separate
power sources.
The audio paths are transformer-coupled and the signaling
circuits are opto-isolated.
• Eliminates grounding problems between intercom systems
• Matches gain
between systems
• Provides system isolation for: Clear-Com to Clear-Com;
Clear Com to RTS®; RTS to RTS
• Passes through and translates signaling
• Provides superior hybrid nulling: up to 40dB
• Setup tone allows
adjustment during operation
• Powered from connected systems
• Uses
just one rack space
• Clear-Com Format
Line Characteristics
Max Level Before Clipping: >=3dBu
Impedance: >=10KO
• Signaling
Receive: <=4V DC
Send: >=11V
DC
• RTS Format
Line Characteristics
Max Level Before Clipping: >=5dBu
Impedance: >=10KO
General Characteristics
Frequency Response: Partyline -
Partyline: 200-8kHz
• Signaling Tone
Send
frequency: 20kHz ±100Hz
Receive frequency: 20kHz ±500Hz
Send level: >=-6dBu
Receive level: <=-25dBu
• Distortion
Partyline - Partyline: <=0.2%
• Max Gain
Clear-Com - RTS: >=9dB
Clear-Com – Clear-Com: >=4dB
RTS – Clear-Com: >=-1dB
RTS -
RTS: >=4dB
• Min Gain
Clear-Com - RTS: <=1dB
Clear-Com – Clear-Com: <=-4dB
RTS –
Clear-Com: <=-9dB
• Power Requirements
Input Voltage Range: 20-30V DC
Input Current (average): <=50mA
• Dimensions
1.75 x 19 x 7.25in (HxWxD)
(45 x 483 x 185mm)
• Weight
5.63lbs
(2.56kg
