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Music Page Interface (MPI)

Lencore’s Music Page Interface (MPI) replaces all the bulky head-end equipment that that is associated with  music and paging systems, eliminating the need for:  
 
  •  additional cable home-runs
  •  amplifiers
  •  separate equalizers
  •  special switching equipment
  •  matching vendors for compatible product interfaces

 

This sophisticated technology allows for  zone additions, modifications, deletions and other changes to the paging system on the fly, without rewiring,  eliminating the need for running multiple home runs back to the electrical closet or through building risers to create separate or additional zones.


The MPI allows the ability to use up to 99 individual zones for paging using standard DTMF tones through a POTS telephone line. The system is also programmed for all-call and emergency broadcast paging. The system’s easy to use full one octave band equalizer can be adjusted to either individual zones or all zones and provides exceptional fine tuning capabilities.

  • When the MPI is connected to the Spectra i.Net’s® web appliance (i.LON®), programming can be set for up to 1.5 million square feet of space through a single device.
  • The Spectra i.Net® MPI incorporates Point Z™ technology allowing each individual speaker channel to carry up to 10 programmable  zones. Paging has never been so versatile & clean.

The creation, modification, addition and deletion of zones or groups for paging and masking can be easily controlled through the i.LON’s® web browser using the included Lencore Sound Manager. No proprietary software needs to be installed on the client’s side, eliminating security and migration issues. The Lencore Spectra i.Net® System is an open platform system. In addition, volume and equalizer settings for paging and music can be programmed through the Sound Manager or Spectra i.Net® Reports offering tremendous adjustment and control capabilities with unprecedented flexibility. 

Adaptive Equalization: The unmatched capabilities and superior paging quality of Lencore’s system automatically compensates and readjusts for frequency line loss while ensuring a quality signal that is continuously and uniformly broadcast and distributed throughout the entire system.  Essentially this means that throughout the miles of audio wire, line loss will be virtually negligible. This results in a crystal clear page whenever you need it, wherever you are in your facility.

The MPI unit typically installs in the Telephone or IT closet. The MPI accepts a POTS line for all-call and zoned telephone paging. In addition, there are left and right audio inputs for music, all-call page, microphone input and testing input.

 

MPI Data Sheet

 


  • Dimensions
    • 6" X 8 3/8" X 1 7/8"
  • Electrical Specifications
    • Input Voltage - 7.5 VDC
    • Input Current - 333 milliamps DC
    • Power Usage - 2.5 watts
    • Power Jack - Mates with 2.1 mm inner, 5.5 mm outer, 11 mm plug length
    • On/Off slide switch
  • Telephone Page Usage
    • Lift telephone receiver
    • Dial access code - (*0) = Backspace
    • Wait for short dial tone
    • Dial two digit paging zone number and the # key
    • Dial 00# for All Call page
    • Wait for short beep
    • Issue Page
    • Hang up - (*) = Hang up after zone is dialed
  • Inputs
    • LonWorks® network. Connects to i.LON® 100 Internet Server.
    • Screw Terminal
    • Audio / Mic input - Microphone input allows stationary mic to be used for MPI input. Dry contact switch allows use to override telephone input.
    • Dry Mic Contact Switch - Sends All Call page to OPs when closed (overrides telephone input.) All Call off when relay is open.
    • Audio / Mic-Tel Switch - Switches between inputs (dry contact overrides switch.)
  • Page
    • POTS line telephone input. RJ11 connector
    • 1. 2 wire (tip and ring) analog appearance
    • 2. Configured to be loop start
    • 3. Battery voltage is 48 volts
    • 4. Loop current is 23 milliamps
    • 5. Must have DTMF signaling capability
    • 6. Must have hang-up (wink) supervision
  • Paging Volume Adjustments
    • Individual channels
    • Maximum output - 5.3 Volt RMS at speaker terminal
    • Attenuation range - 48 dB, in 1 dB stpes, plus a mute setting
  • Paging Zones
    • Individual channel, groups or global paging zones
    • Point Z™ Technology (Each channel can carry 10 programmable zones)
  • Page Testing Settings
    • Service Button 1 - starts All Call page and set to on or off
    • Used for sending continuous audio over inputs for testing
    • Service Button 2 - sends test audio files over page lines
  • LED Guides for Voltage Inputs
    • On back of MPI unit there are two potentiometers to adjust audio and voltage inputs for both paging and music. The LED displays on the front of the unit provides visual confirmation that voltage are in range.
    • LED's 1 (Page) - No Light: No input.
    • LED's 1 (Page) - Yellow Light: Telephone / Audio input too low.
    • LED's 1 (Page) - Blue Light: Good.
    • LED's 1 (Page) - Red Light: Hot.
    • LED's 2 (Music) - No Light: No input.
    • LED's 2 (Music) - Yellow Light: Telephone / Audio input too low.
    • LED's 2 (Music) - Blue Light: Good.
    • LED's 2 (Music) - Red Light: Hot.
  • Emergency Broadcast / Music Volume Adjustments
    • Independent Channels
    • Maximum output - 5.3 Volt RMS at speaker terminal
    • Attenuation range - 48 dB, in 1 dB steps, plus a mute setting
  • Emergency Broadcast / Music Zones
    • Individual channel, groups or global music zones
  • Paging / Emergency Broadcast / Music Octave Equalizer
    • One page / music equalizer for all channels
    • 10 bands, 31 Hz to 16 KHz, each user adjustable by +/- 5 dB in 1 dB steps
  • Power Supply
    • Input from building power - 100 -240 VAC, 60-60 Hz, 1.0 A
    • Output to MPI device - 7.5 VDC, 4.0 A, 30 W max
  • Stereo Music
    • Left channel, 10k ohm input impedance, unbalanced, single ended RCA jack (phono connector)
    • Right channel, 10k ohm input impedance, unbalanced, single ended RCA jack
    • Input impedance is 10K ohms
    • Gain from RCA jack to RJ45 pins 7 & 8 is 2 when internal potentiometer is set to maximum (with 620 ohm terminator.)
    • NOTE: Left and right channels are combined to form one music input. All music inputs use the RCA jacks are single ended inputs.
  • Recommended Setting of Interal Potentiometer of Music Input
    • USA professional audio, +4 dBu, 1.228 Vrms 10 o'clock position (approximate)
    • Consumer audio, -10 dBV, 0.316 Vrms 3 o'clock position (approximate)
    • Tungsten T3 PDA, 5 o'clock position (approximate)
    • iPod, 3 o'clock position (iPod volume set to 3/4)
    • 1 Vrms signal generator, 10 o'clock position (approximate)
    • 0.7746 signal generator, 11 o'clock position (approximate)
    • Example: Set POT to min if input is 1 Vrms, set POT to max if input is 0.25 Vrms, *Do NOT exceed 1 Vrms
  • Outputs
    • Cat 5e data cable, RJ45 connector. Connects to OPs
    • Page output, pins 4 and 5 of RJ45 is a balanced output
    • Music output, pins 7 and 8 of RJ45 is a balanced output
    • Two ground (common) screw terminal block. Connects to (-), ground, of first OP
  • Besides the normal Adaptive EQ procedures these output signals can be used as a signal generator. All measurements are made differentially with a ground strap from MPI board to test equipment. Short Cat 5e were used, approximately 6-feet.
    • 31 Hz - 0.440 Vrms (1.2445 Vp-p (unterminated), 0.297 Vrms (0.8400 Vp-p) terminated into 620 ohms
    • 63 Hz - 0.495 Vrms (1.4001 Vp-p (unterminated), 0.410 Vrms (1.1597 Vp-p) terminated into 620 ohms
    • 125 Hz - 0.514 Vrms (1.4538 Vp-p (unterminated), 0.460 Vrms (1.3011 Vp-p) terminated into 620 ohms
    • 250 Hz - 0.518 Vrms (1.4651 Vp-p (unterminated), 0.475 Vrms (1.3435 Vp-p) terminated into 620 ohms
    • 500 Hz - 0.516 Vrms (1.4595 Vp-p (unterminated), 0.476 Vrms (1.3463 Vp-p) terminated into 620 ohms *500 Hz is best for field testing
    • 1 KHz - 0.500 Vrms (1.4142 Vp-p (unterminated), 0.463 Vrms (1.3096 Vp-p) terminated into 620 ohms
    • 2 KHz - 0.450 Vrms (1.2728 Vp-p (unterminated), 0.417 Vrms (1.1795 Vp-p) terminated into 620 ohms
    • 4 KHz - 0.348 Vrms (0.9843 Vp-p (unterminated), 0.322 Vrms (0.9108 Vp-p) terminated into 620 ohms
    • 8 KHz - 0.241 Vrms (0.6817 Vp-p (unterminated), 0.223 Vrms (0.6307 Vp-p) terminated into 620 ohms
    • 16 KHz - 0.186 Vrms (0.5261 Vp-p (unterminated), 0.172 Vrms (0.4865 Vp-p) terminated into 620 ohms