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Telex BP-351 2-Channel Portable Beltpack Headset Station with 4-Pin XLR Connector (Gray)

B&H # TEBP351A4FG MFR # F.01U.118.763
Telex BP-351 2-Channel Portable Beltpack Headset Station with 4-Pin XLR Connector (Gray)


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The gray BP-351 2-Channel Portable Beltpack Headset Station with 4-Pin XLR Connector from Telex features a user programmable microprocessor assisted interface. It allows mono operation. The beltpack includes a channel select button, remote microphone off feature, separate talk button, and a call light in an extruded aluminum case.

The portable metal beltpack is used with RTS 2-wire intercom systems. It is a microprocessor controlled 2-channel select intercom beltpack. The beltpack has connections for headset / earset microphones (dynamic or electret). It also has an auto-sensing function that automatically detects the headset microphone and powers it if the microphone is electret.

Built-in auto-sensing headset connector that will determine automatically whether a dynamic or electret headset is connected to the system
Call function allows the user to send or receive call signals to or from other devices on the intercom channel, including audible call alert on the listen side
Microprocessor controlled microphone kill detect
Powered externally, via the intercom system power supply on channel 1 or 2
Headset 4-pin XLR connection
UL listed
UPC: 800549427586
Interface Interface Requirements
Headset/Earset: 50 to 200 Ω dynamic microphone, 50 to 600 Ω headphones

RTS Intercom Channel
Output Level: 0.775 Vrms (0 dBu) nominal
Bridging Impedance: greater than 10 kΩ

Call Signaling
Send: 20 kHz ±100 Hz, 250 mVrms ±10%
Receive: 20 kHz ±800 Hz, 100 mVrms

Mic-Off Frequency Detect: 24 kHz ±800 Hz, 100 mVrms

Noise Contribution to 200 Ω Intercom Line: -75 dBu
Headphone Amplifier Maximum Output: 60 mW into 150 Ω
Frequency Response: 200 Hz to 8 kHz +1/-3 dB nominal
Audible Alert: 1 kHz tone
Total Harmonic Distortion: Less than 0.2% nominal at 50 mW from the line
Sidetone: 20 dB minimum range, adjustable
Pin Configurations Connector Pin Configurations
Intercom Channel Connector: XLR-3 M/F (Pin 1 Common, Pin 2 +30 VDC In & audio, and Pin 3 Syst Chan 2) 1
Please Note:

the +30 VDC pin can be connected to channel 2

Headset Connector Type: XLR-4F
Pin 1: Headset microphone low
Pin 2: Headset microphone high
Pin 3: Headphone low
Pin 4: Headphone Chan 1 or Chan 1 and Chan 2 audio
Power Requirements 30 VDC nominal (standard RTS line), 45 to 70 mA
Storage Temperature -4 to 176°F (-20 to 80°C)
Operating Temperature 32 to 122°F (0 to 50°C)
Storage Humidity Storage / Operating: 0 to 95% humidity, non-condensing
Dimensions (H x W x D) 5.0 x 3.5 x 1.8" (127.0 x 88.9 x 45.7 mm)
Weight 13 oz (364 g)
Packaging Info
Package Weight 1.2 lb
Box Dimensions (LxWxH) 8.4 x 6.3 x 2.3"
Telex BP-351 2-Channel Portable Beltpack Headset Station with 4-Pin XLR Connector (Gray)
  • Limited 3-Year Warranty
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