Clear-Com PL-PRO EF-1M Instruction Manual
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Clear-Com PL-PRO EF-1M Instruction Manual

Clear-Com PL-PRO EF-1M Instruction Manual

4-wire and matrix direct interface
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EF-1M
INTERFACE
I N S T R U C T I O N M A N U A L

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  • Page 1 EF-1M INTERFACE I N S T R U C T I O N M A N U A L...
  • Page 2 U.S.A Clear-Com is a registered trademark of Clear-Com Intercom Systems. The Clear-Com Logo is a registered trademark of Clear-Com Intercom Systems. Matrix Plus is a registered trademark of Clear-Com Intercom Systems. RTS is a registered trademark of Telex Communications, Inc.

  • Page 3: Table Of Contents

    CONTENTS QUICK START OPERATION Description Connecting a Party-Line Channel to a Matrix Frame Port Converting a Party-Line Channel to 4-Wire Audio Front Panel Controls Rear Panel Settings and Connectors INSTALLATION Connecting the EF-1M Interface Connecting the EF-1M to a Matrix Port Connecting the EF-1M to a Modem Connecting the EF-1M to RTS-TW Equipment Other Connections...
  • Page 4 Nulling Adjusting the Null Troubleshooting Tips for Nulling Internal Adjustments 3-10 TRANSMISSION METHODS Direct Connection Fiber-Optic Other Methods MAINTENANCE Troubleshooting Tips Block Diagram Component Layout Bill of Materials GLOSSARY SPECIFICATIONS E F - 1 M I N T E R F A C E...
  • Page 5 CLEAR-COM LIMITED WARRANTY Factory Service Warranty Repair Non-Warranty Repair E F - 1 M I N T E R F A C E i i i...
  • Page 6 E F - 1 M I N T E R F A C E...

  • Page 7: Quick Start

    2. Attach the connection diagram label to a convenient surface, such as the bottom of the EF-1M unit. 3. To connect the EF-1M directly to a Clear-Com Matrix (MX+3, MX+2) frame port, connect an RJ-45 cable from the RJ-45 connector on the EF-1M rear panel to the Follow these instructions Matrix port.
  • Page 8 8. Plug in the test earpiece and set the null for each location using the procedure described in “Adjusing the Null” in Chapter 3. Adjust the null on other stations and beltpacks if required. 9. Adjust send and receive levels at each location as described in “Levels” in Chapter 3. E F - 1 M I N T E R F A C E 1 - 2...

  • Page 9: Operation

    Please read this manual completely to better understand the EF-1M Interface. For or systems together questions not addressed in this manual, contact your dealer, distributor, or Clear-Com over various directly. Our applications support and service people are ready to help.
  • Page 10 Matrix frame. At the same time, the EF-1M interfaces a DC-voltage call signal or 20-kHz call signal to the Matrix. The EF-1M is recognized by the Matrix as a Clear-Com CCI-22 Interface. It provides the same function as the CCI-22 Interface with the following exceptions: •...

  • Page 11: Converting A Party-Line Channel To 4-Wire Audio

    CONVERTING A PARTY-LINE CHANNEL TO 4-WIRE AUDIO The EF-1M converts The EF-1M Interface converts a channel of standard or TW party line to 4-wire audio standard or TW party line and, at the same time, converts a DC-voltage call signal or 20-kHz call signal to RS-422 to 4-wire audio and, at the data.
  • Page 12 Call signaling can serve as more than simply a visual indicator. A call signal can activate Call signaling can serve relays and trigger functions in other connected Clear-Com equipment. The Clear-Com as more than merely a TW-40 Two-Way Radio Interface and KB-212 Speaker Station use this feature. Imagine a party-line (PL) system connected to a fiber-optic system over a 1-kilometer fiber as shown visual indicator.
  • Page 13 Because of the EF-1M’s low profile and compact size, it can function either as a Because of the EF-1M’s stand-alone device, or it can be mounted on utility rack shelves. Up to three units will fit low profile and compact horizontally in one-rack unit (1RU) of space and will offer sufficient vertical clearance to accommodate a variety of mounting methods.
  • Page 14 point is that the modem, multiplexer, or converter for the transmission medium (the system that the EF-1M connects to via the DB-15) must accept line-level (-15 dBV to +4 dBV) 4-wire audio and, if call signal is desired, RS-422 data. EF-1M Party-Line Intercom EF-1M...

  • Page 15: Front Panel Controls

    FRONT PANEL CONTROLS You adjust sidetone and volume “listen levels” with the EF-1M’s front panel controls. Figure 5: Front panel of an EF-1M unit Local Send controls the audio signal level from the local 2-wire intercom (the system connected to this EF-1M) to the audio out of the 4-wire I/O. This control has a range of ±12 dB.
  • Page 16 Sidetone Null Adjustment This set of three trimpots includes R=Resistance, L=Inductance, and C=Capacitance. These compensate for each component of the line impedance, providing the best null possible. To prevent damage to the level control and nulling trimpots, do not force them past their stop points. Power LED This green LED will illuminate when the EF-1M is receiving power from pin 2 of the party-line XLR connection.

  • Page 17: Rear Panel Settings And Connectors

    Switch 1 adjusts the EF-1M’s connector settings for use with either 4-wire fiber (the ON position) or a matrix intercom (the OFF position). Switch 2 adjusts the EF-1M’s connector intercom levels for use with either Clear-Com equipment (the OFF position) or RTS-TW equipment (the ON position). Table 1 summarizes the mode switch settings.
  • Page 18 3-Pin XLR Connector (Party Line I/O) The female 3-pin XLR jack on the EF-1M’s back panel connects to the 2-wire party line. If a loop-through connection is needed, use a high quality “Y” cable like the Clear-Com SP-3. NOTE: Each (local) party-line channel must have one, but only one, termination. (See Figure 7 on page 3-4.)
  • Page 19 Shorting pins 8 and 15 together, or setting mode-switch 2 to ON adjusts the unit to respond to 20-kHz call signal instead of DC voltage and adjusts audio levels for connection to RTS TW lines. There are also connections for audio and data shields if present in the wiring. RJ-45 Connector When mode-switch 1 is set to Matrix Direct mode (ON), the RJ-45 connects to the Matrix frame.

  • Page 20: Installation

    Clear-Com Matrix frame port. To connect the EF-1M directly to a Clear-Com Matrix (MX+3, MX+2) frame port: 1. On the EF-1M’s back panel, set mode-switch 1 to the ON position. The Data LED will remain ON, except when the unit is being nulled.

  • Page 21: Connecting The Ef-1M To A Modem

    RTS-TW lines. If you set mode-switch 2 to the OFF position, the DC voltage call signal is selected and line levels are optimized for Clear-Com. Shorting pins 8 and 15 of the DB-15 connector on the EF-1M’s back panel will also select the 20-kHz call signal and adjust audio levels for connecting to RTS-TW lines.
  • Page 22 The four pairs of cable used for full operation include one each for audio in and audio out and one each for RS-422 data in and data out. Take care to wire the DB-15 or RJ-45 pins correctly. For added reference, the illustration on page 3-4 (Figure 7) shows the pinout configuration.
  • Page 23 Matrix RJ-45 Intercom Line 4-Wire Audio / Data 1 2 3 4 5 6 7 8 XLR-F Jump for TW Open for C-C + Matrix RS-422 from EF-1M (Not Used) - Matrix RS-422 from EF-1M - RS-422 Local Receive + Matrix Audio from Party Line - RS-422 Local Transmit + Matrix Audio to Party Line + RS-422 Local Receive...

  • Page 24: Connecting The Ef-1M To Rts-Tw Equipment

    EF-1M). The audio channel carried on pin 2 of a TW line (Clear-Com or RTS) will not be connected through the EF-1M; however, it will not be negatively affected.

  • Page 25: Levels

    0 dBV range at the 4-wire interface. If different intercom brands are used appropriate. on opposite ends of a pair of EF-1M units (RTS and Clear-Com for example), the controls may need to be adjusted outside of the normal range. Otherwise, more extreme settings could indicate a problem elsewhere in the system.

  • Page 26: Nulling

    NULLING “Sidetone” is the sound of the operator’s own voice in his or her headset or speaker. With interfaces, it is necessary to “null” (minimize) the sidetone when external party lines are connected over the secondary transmission media. Ideally, there should be no portion of the talk signal in the listen signal.

  • Page 27: Adjusting The Null

    Adjusting the Null Normally, the following adjustment is made once during installation. (If the configuration of the local party-line system changes substantially, it may be necessary to re-null the system for optimum performance.) 1. Connect all the local party-line devices for that channel together and to the EF-1M. 2.

  • Page 28: Troubleshooting Tips For Nulling

    If the “L” control is fully turned in either direction, it is likely that there is a problem in the external party line. With a Clear-Com party line connected, the “L” should be slightly to either side of the mid-pot position.

  • Page 29: Internal Adjustments

    INTERNAL ADJUSTMENTS The only user-adjustable internal setting is selection of the baud rate for the RS-422 data. You can set the baud The factory-set baud rate for the RS-422 data is 19.2 kilobits per second (19.2 kbps). For certain transmission schemes, the baud rate is internally selectable for 2400, 4800, or rate for 2400, 4800, or 9600 bits per second.
  • Page 30 6. Lift off the cover. 7. Make the necessary adjustments of jumpers P3 and P4 (shown in the following table). To set a jumper to the closed position, plug it onto both pins. To set a jumper to the open position, plug it onto only one of the pins. BAUD 1 BAUD 2 RATE...

  • Page 31: Transmission Methods

    TRANSMISSION METHODS DIRECT CONNECTION There are many instances where twisted-pair cable is available for audio connections. This wiring is typically found in unused telephone cable in or between buildings. Figure 8 illustrates twisted-pair wiring connections. EF-1M EF-1M DB-15 Pins Twisted Pair Wiring DB-15 Pins - RS-422 Transmit - RS-422 Receive...

  • Page 32: Fiber-Optic

    Simply connect the 4-wire audio and 4-wire data between EF-1M units utilizing this Use twisted-pair cable. This will form a direct connection between the DB-15 connectors on a pair of cable to connect EF-1M units. The PL systems at each end of the cable will require their own power and termination for their local channel.
  • Page 33 There are two basic modes of fiber-optic transmission. In a multimode fiber, the light travels through the fiber via multiple paths. In a single-mode fiber, the light travels in a single path. Depending on the equipment, single or multiple channels of audio, video, data, or a mix thereof can be multiplexed and carried in either one or both directions.

  • Page 34: Other Methods

    LEDs as the light source. cable, and the For dedicated use, Clear-Com has found that the FiberOptions 249B series (multimode, selected wavelength. single channel) works well for most single channel applications. Range is up to 2.5 km (1.55 miles) with negligible signal loss at 1 km (0.62 mile) or less.

  • Page 35: Maintenance

    MAINTENANCE TROUBLESHOOTING TIPS Listed below are symptoms, causes, and solutions for some of the more common problems that may occur. AUDIO TROUBLESHOOTING TIPS Symptom Cause Solution Squealing feedback, levels The local PL channel is not terminated. Check termination switches on PL too high, distortion, call equipment and set appropriately.
  • Page 36 1. Always begin a setup with these set to one end to the other. available on the modems. their nominal levels. 2. Clear-Com/RTS jumper is set 2. Reset jumper. incorrectly. Excessive noise or poor Various causes related to modems and Know the performance parameters of the frequency response.
  • Page 37 DATA TROUBLESHOOTING TIPS Symptom Cause Solution Data LED is off even 1. Problem in the wiring from the 1. Adjust wiring. though units are DB-15 to the modem or problem with connected at each end. the transmission medium. 2. Baud rate or other modem 2.
  • Page 38 2. DB-15 is wired incorrectly at other 2. Check wiring. end. This will happen if an RTS-TW channel is connected at one EF-1M and a Clear-Com is connected at the other, but the DB-15 on the RTS end has not been wired properly. 5 - 4...
  • Page 39 NULLING TROUBLESHOOTING TIPS Symptom Cause Solution No audio; green LED is EF-1M is not receiving power. EF-1M units at both ends of the connection off. must receive power from a local PL system. Unsatisfactory null. 1. Unstable PL system due to excessive 1.

  • Page 40: Block Diagram

    BLOCK DIAGRAM EF-1M TW Power Power Splitter Intercom Power Line Hybrid Null Receive Send 4-Wire 4-Wire Output Input Gain Nulling Adj. C-C Call Gain 20 kHz Call Earphone Adj. Send & Receive 20 kHz 200 Hz Phone Receive Call Null Det.

  • Page 41: Component Layout

    COMPONENT LAYOUT Figure 11: EF-1M PCB Component Layout Drawing E F - 1 M I N T E R F A C E 5 - 7...

  • Page 42: Bill Of Materials

    BILL OF MATERIALS EF-1M PCB CAPACITORS Value Type Volts Tol. Part# Designator Aluminum NP 150002 Ceramic Disc 1.4KV 150029 Aluminum 150037 C48 C52 2700 2700PF PLY 2.5% 150086 Aluminum NP 150087 Ceramic Disc SMD 151116 Ceramic Disc SMD 151119 Ceramic Disc SMD 151120 C21 C22 C43 C63 Ceramic Disc SMD...
  • Page 43 Value Type Volts Tol. Part# Designator Tantalum SMD 151192 C49 C51 C53 C59 Aluminum SMD 151200 C60 C58 RESISTORS AND RESISTOR PACKS Value Power Type Tol. Part# Designator Carbon Film 410002 4.7K Carbon Film 410013 Carbon Film 410061 1/10 411100 1/10 411197 22.1...
  • Page 44 Value Power Type Tol. Part# Designator 10.0K 1/10 411485 R6 R21 R22 R28 R29 R35 R39 R44 R47 14.3K 1/10 411500 15.0K 1/10 411502 R85 R68 19.1K 1/10 411512 20.0K 1/10 411514 R46 R41 22.1K 1/10 411518 R52 R74 27.4K 1/10 411527 33.2K...
  • Page 45 Device Description Part# Designator Transistor 2222A NPN 40V 600MA... SMD 481026 Q4 Q6 Q9 Transistor 2907A PNP 60V 600MA... SMD 481027 Diode BAV99 DUAL DIODE... SMD 481033 D7 D9 D10 Transistor MPSA14 DNPN 30V 300MA... SMD 481038 DG444 QUAD 481050 ANALOG SW Diode 5.1V 5% ZENER 1/4W...

  • Page 46: Glossary

    GLOSSARY Category 3, 5, 5e, or 6 cable: EIA/TIA 568 category specification relating to the performance of network cabling. All are adequate for EF-1M wiring. CODEC : A device that enCODes and DECodes data. The glossary gives Drop(s) : A point or points in the party-line system where a beltpack or station is present. definitions of For purposes of this discussion, a drop is any point on a common channel where an technical terms...
  • Page 47 The circuit cards connect to external intercom devices (stations, interfaces, 4-wire audio) through the RJ-45 connectors on the back panel. Each RJ-45 connector is called a “port.” Clear-Com supports the Matrix Plus 3 (MX+3) and Matrix Plus 2 (MX+2) software platforms.
  • Page 48 Sidetone : The sound of your own voice transmitted through an earphone as you speak. Termination: A fixed load placed upon the Clear-Com party line to maintain stability. Two-wire audio : A single shielded-pair cable carrying a single channel of bidirectional (talk and listen) audio.

  • Page 49: Specifications

    11 Volts minimum on audio line Call Signal (RTS Mode) Input/Output: 20 kHz 0 dBv is referenced to 0.775 V RMS Nulling Capability Party Line Characteristics (Clear-Com Mode) Depth of Null: >30 dB, 200 Hz–8 kHz Frequency Response: 200-10 kHz ± 3 dB Line Length: 2 ft.–...
  • Page 50 Data Dimensions Baud rate: 19.2 kilobits per second, selectable for Height: 1.62 in. (41 mm) (1 RU, EIA rack) 2400, 4800, or 9600 baud Width: 5.94 in. (151 mm) Settings: 8 data bits; 1 stop bit; no parity Depth: 4.80 in. (122 mm) Weight: 1.75 lbs.

  • Page 51: Clear-Com Limited Warranty

    This warranty is the sole and exclusive express warranty given with respect to Clear-Com returns. products. It is the responsibility of the user to determine before purchase that this product is suitable for the user's intended purpose.

  • Page 52: Factory Service

    Contact the factory. Send equipment to be repaired to: Customer Service Department Clear-Com Intercom Systems 4065 Hollis Street Emeryville, CA 94608-3505 Telephone: (510) 496-6666 Fax: (510)496-6610 Web site: www.clearcom.com...

  • Page 53: Warranty Repair

    NON-WARRANTY REPAIR Equipment that is not under warranty must be sent prepaid to Clear-Com. If requested, an estimate of repair costs will be issued prior to service. Once repair is approved and repair of equipment is completed, the equipment will be shipped freight collect from the factory.
  • Page 54 NOTES...
  • Page 55 NOTES...

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