ASL Intercom PS150

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  • 1. PRO SERIES USER MANUAL FOR THE PS 150SINGLE CHANNEL TELEPHONE INTERFACE CONTENTS 1.0 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . 3 2.0 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4.0 FRONT PANEL CONTROLS . . . . . . . . . . . . . . . . . . . . . 4 5.0 REAR PANEL CONNECTORS . . . . . . . . . . . . . . . . . . . 5 6.0 CABLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.0 PARTY LINE, TECHNICAL CONCEPT . . . . . . . . . . . . . 7 8.0 GUARANTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 9.0 TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 7User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 2. 2 User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 3. 1.0 GENERAL DESCRIPTION The PS 150 is designed to interface the ASL intercom The PS 150 is a combination of two interfaces. system (3-wire, party line) to the telephone system One for interfacing the intercom line to a separate input (2-wire). and output, and one for interfacing the telephone line to a For example communication can be realised between a separate input and output. normal telephone and one or more ASL stations, or These inputs and outputs are internally (cross-) connected. between two ASL systems via a telephone-line. The two-stage sidetone circuit (level, hi) allows you to The PS 150 is a sub-station and receives power from the obtain an input/output separation better than 30 dB from intercom line. 20Hz to 20KHz. The built in testtone generator helps you to adjust or check the sidetone level at any time. 2.0 UNPACKING The shipping carton contains the parts listed below * The PS 150 * Set of telephone cables * User manual If any are missing, contact your dealer. ASL has taken great care to ensure this product reaches you in flawless condition. After unpacking the unit please inspect for any physical damage to the unit, and retain the shipping carton and relevant packing materials for use should the unit need returning. If any damage has occurred, please notify your dealer so that a written claim can be initiated. Please also refer to the guarantee section of this manual. 3.0 MECHANICAL INSTALLATION The PS 150 will interface between ASL partyline (3-wire If your telephone system does not use the FCC type intercom) and 2-wire telephone systems. connectors we have applied on the PS 150 you can use these extra cables for interconnecting. To connect the PS 150 with ASL partyline system, use professional flexible microphone cable with 2 wires and 1 Connection procedure : shield only. Connect the partyline system cable into the 1. Lift the covers of the telephone line connector and the intercom line connector on the rear. telephone plug, which your system applies. To connect the PS 150 with the 2-wire telephone system, use the telephone cable to the FCC type connector on the 2. Use their connection screws for attaching the four rear. leads coming from each cable following these colour assignments: There are no separate power connections to install since yellow EB the necessary DC voltages are derived from the ASL green b partyline. red a black ground The PS 150 is fully protected against mis-wiring (reverse power) or short circuit in the interconnecting cables. 3. Put the covers back in place.User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 3
  • 4. 4.0 FRONT PANEL CONTROLS The PS 150 is a combination of two interfaces. The telephone line sidetone rejection may be rather poor One for interfacing the intercomline to a separate input and compared to the intercomline sidetone rejection because output, and one for interfacing the telephone line to a of the complex impedance of the telephone line. separate input and output. These inputs and outputs are internally cross connected. Because the PS 150 combines two interfaces, a decrease of sidetone rejection in all intercom stations connected to Both interfaces have their own sidetone trimmers. the same channel as the PS 150 might occur. The two sidetone trimmers at the left side of the front panel control the internal input/output separation of the intercom If speaker stations are connected, internal feedback may line interface. occur. The sidetone trimmer in the right of the front panel controls If this problem arises, it can be solved by keeping the send the internal input/output separation of the telephone line and receive levels of the PS 150 low and by turning the interface. speaker attenuator trimmers of the howling speaker For prevention of internal feedback or a hollow sound in station(s) anti clockwise. both systems all sidetone trimmers must be adjusted care- fully. 1 SIDETONE LEVEL trimmer (INTERCOM LINE) SIDETONE ADJUSTMENT PROCEDURE This trimmer controls the internal input/output - plug a headset in the test headset connector. separation of the intercom line interface. - set receive level to minimum. It also compensates the resistance of the set send level to maximum. interconnecting cables. - set intercom line sidetone trimmers in start position : For sidetone adjustment procedure see 4.4. level : turn fully clockwise. hi : turn fully anti-clockwise. 2 SIDETONE HI trimmer - activate the testtone generator. This trimmer controls the internal input/output - decrease testtone level by turning the level trimmer separation in the high-frequency range. anti-clockwise. It compensates the capacity of the interconnecting adjust for minimum level. cables. - decrease the remaining high-frequencies by turning the hi trimmer clockwise. 3 SIDETONE TEST knob - repeat the last three steps until you are sure you have This hidden pushbutton switch activates a testtone obtained the best possible settings. generator which adds a 200Hz tone to the internal - set telephone line sidetone trimmer in start position: input signal of the intercom line interface. turn level trimmer fully clockwise. It allows you to adjust or check the sidetone trimmer - connect an ASL sub-station (beltpack, speaker station) settings of the intercom line interface. to the intercom channel and adjust its sidetone for minimal level. Note: Make sure you are not disturbing any - connect the PS 150 to the telephone line and make communication because the test-tone is placed on the connection with the front panel connect switch. intercomline which implies that all stations on that - Turn up receive level slowly while speaking into the channel can hear the test tone. headset mike. The volume of your voice will increase. - Turn telephone line sidetone level trimmer anti- 4 SIDETONE LEVEL trimmer (TELEPHONE LINE) clockwise and adjust for minimum level. This trimmer controls the internal input/output separation of the telephone line interface.4 User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 5. 4.0 FRONT PANEL CONTROLS 5 TEST HEADSET connector 7 HOLD indicator led This connector allows you to listen to the intercom line This led illuminates if you have switched the telephone during the sidetone adjustment procedure (see 4.4 ), or line to the PS 150. continuously. It indicates that the telephone line is occupied (by the You can plug in a headset or headphones. PS 150). Pin assignment : 1. not connected 8 RECEIVE volume control knob 2. not connected This knob controls the listen level of the telephone line 3. phones + signal as it is received by the intercomline. 4. phones (GND) 9 SEND volume control knob 6 CONNECT switch This knob controls the listen level of the intercom line This switch connects the telephone line to either the signal as it is send to the telephone line. telephone or to the telephone interface. 10 POWER INDICATOR If you switch the telephone line to the PS 150, the hold This LED illuminates if line power is supplied by the indicator illuminates. power supply or master station of the ASL intercom If you have switched the telephone line from the system in which the PS 150 is used. telephone to the PS 150, you may place the telephone handset back on the hook, because the PS 150 will hold the connection. 5.0 REAR PANEL CONTROLS At the rear panel you will find the connectors for inter 14 TELEPHONE LINE connector connecting the PS 150 within the ASL intercom system This connector is for connecting the telephone line. and within the telephone system. Pin assignments : The telephone line connection is transformer balanced. 1 not connected 2 EB 12 INTERCOM IN connector 3 b This XLR-3 is for connecting the intercomline. 4 a Pin assignments : 5 ground 1. 0V / ground shield 6 not connected 2. + 30V power wire 3. audio wire The pin 3 and 4 of the telephone line connector are switched to pins 3 and 4 of the telephone connector 13 INTERCOM LINK connector when the PS 150 is off-line (HOLD led is off), and This output is for extending the intercom line to other switched to the interface when the PS 150 is on-line sub-stations. (HOLD led is lit). It is linked to the intercom line input connector and has the same pin assignments. 15 TELEPHONE connector This connector is for connecting a telephone, a telephone bell or any other telephone apparatus. Pin assignments : see 14. The pins 2 and 5 of the telephone connector are always interconnected with pin 2 and 5 of the line connector.User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 5
  • 6. 7.0 CABLING For the PRO Series Intercom system the interconnecting cables are of the shielded two-conductor microphone cable type and the intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power. Since the audio signal is transferred in an unbalanced ¼ way, certain rules have to be obeyed when installing the cables of an intercom network. This is to avoid earth loops and to minimize power loss and the possible effect of electromagnetic fields. These rules are: Use high quality (multipair) cable. Keep cables parallel as much as possible For interconnecting user stations, power supplies and When two (multi channel) units in a network are accessories in an ASL Intercom network, use high connected by more than one cable, make sure that quality shielded two-conductor (minimum 2x 0.30 mm2) these cables are parallel to each other over the whole microphone cable only. distance between those units. When using multipair In case of a multi channel intercom network, use high cable, parallelism is ensured in the best possible way. quality microphone multipair cable only, each pair consisting of two conductors (minimum 2x 0.15 mm2) Avoid closed loops. with separate shield. Multipair cable should also have Always avoid that cables are making a loop. So-called an overall shield. ring intercom should not physically be cabled as a ring. All cable routes should have a star configuration, Use flexible cables. with the central earthing point (usually close to the Use flexible single and multipair microphone cable power supply position) as the centre of the star. instead of cable with solid cores, especially when the cable is subjected to bending during operation or Keep cables away from electromagnetic sources. installation. Keep intercom cables away from high energy cables, e.g. 110/220/380V mains power or dimmer controlled Separate cable screen to XLR pin 1. feeds for spotlights. The screen of each separate microphone cable and/or Intercom cables should cross high energy cables at an the screen of each single pair in a multipair cable, angle of 90 only. should be connected to pin 1 of each XLR-3 connector. Intercom cables should never be in the same trunking Do not connect this cable screen to the metal housing as energy cables. of the connector or to metal wall boxes (outlets). See page 10 for Earthing Concept. Place power supplies in a central position. In order to avoid unacceptable power losses, place the Cable trunks, connection boxes and overall power supplies as close as possible to where most multipair cable screen to clean earth. power consumption occurs or, in other words, most Metal cable trunks, metal connection boxes and overall user stations are placed. multipair cable screen should be interconnected and, at one point (the central earthing point) in the intercom Connect ASL power supply to a clean mains network only, be connected to a clean safety earth. outlet. See page 10 for Earthing Concept. The ASL power supply may be connected to the mains power outlet to which other audio equipment is Keep metal connection boxes and cable trunks connected. Avoid using mains outlets which also power isolated from other metal parts. dimmer controlled lighting systems. Metal housings for intercom cables and connectors should be mounted in such a way that they are isolated In case of more complex installations, dont hesitate to from other metal cable and connector housings and contact us. Please send us a block diagram of the from any other metal construction parts. planned network with a list of all user stations and their positions, and we are happy to advise you on cabling lay-out. ¼ See Party Line, Technical Concept 6 User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 7. 8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 150 ASLs PRO Series offers a complete two way (full duplex) INTERCOM LINE DRIVER communications system. Max. output current 3mA rms Users of the system are connected via a party line. output impedance 150 kOhm Master stations (with built-in power supply), beltpacks, speaker stations and power supplies are interconnected INTERCOM LINE SIDETONE via standard microphone cable. One wire is used as an rejection 34 dB (20 Hz - 20 kHz) audio line, one as a power line and the screen of the cable cable compensation 0 - 1000 meters functions as earth/return. TELEPHONE LINE DRIVER Current drive is used for signal transfer. Each station output impedance 600 Ohms utilises a current amplifier to amplify the microphone signal max. output +14 to -34 dBm and place it on the common audio line where, due to the freq.response 150 Hz - 6 kHhz (-3 dB) constant line impedance (situated in the power supply between XLR pin 3 and 1), a signal voltage is developed TELEPHONE LINE SIDETONE which can be further amplified and sent to headphones or rejection 10 dB (300 Hz - 3 kHz) loudspeakers. TEST HEADSET This principle has three advantages: impedance 4 - 2000 Ohms - the use of a single audio line allows several stations to talk and listen simultaneously. - due to the high bridging impedance offered by each GENERAL SPECIFICATIONS station, the number of stations on line has no supply voltage +30 VDC (12 V to 32 V) influence on the level of the communications signal. supply current 35 mA quiescent - power and audio to the intercom stations use the same audio line level -18 dBm (max. 0 dBm) cable. signal-to-noise 80 dB station bridging impedance 150 kOhm The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which dimension 483 x 44 x 124 mm will be sensed by each station and interpreted as a Call weight 2800 grams signal. Note: 0 dBu = 775 mV into open circuit. ASL reserve the right to alter specifications without further notice. 9.0 GUARANTEE This unit is warranted by ASL Intercom to the original end- user purchaser against defects in workmanship and materials in its manufacture for a period of one year from the date of shipment to the end-user. Faults arising from misuse, unauthorised modifications or accidents are not covered by this warranty. If the unit is faulty, it should be sent in its original packing to the supplier or your local ASL dealer, with shipping prepaid. A note must be included stating the faults found and a copy of the original suppliers invoice. THIS PRODUCT WAS DESIGNED, DEVELOPED AND MANUFACTURED BY : AMPCO SOUND LAB BV MAARSSEN (UTRECHT) HOLLANDUser Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 7
  • 8. 8 User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 9. User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 9
  • 10. 10 User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
  • 11. User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 11
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