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1、KI-1 589 TC4171 COA Module, TC4181 Repeater Amplifier, and TC4180 Expander Chassis Installation RAULAND-BORG CORPORATION ? 3450 West Oakton Street, Skokie, Illinois 60076-2951 ? (708) 679-0900 Preliminary Description The TC4171 Module (Central Office Adapter,” or COA”) is an FCC-approved device for
2、connecting a Telecenter IV or Telecenter TCS system to an outside telephone trunk; it can also be used for connecting these systems to a line from a PBX. The module endbles the system to detect outside calls, receive such calls, and call via an outside trunk. The TC4181 Repeater Amplifier boosts inc
3、oming and outgoing audio by 6.5 decibels. This offsets the losses that occur inside the Telecenter system. These losses can cause reduced and noisier audio levels on interconnected lines; in some cases, they can cause dialing problems. For these reasons, Rauland highly recommends the use of a repeat
4、er amplifier with every COA Module. The Canadian Stan- dards Association (CSA) requires repeater amplifiers for Canadian installations. The CSA-approved R-TEC VFR1050 (List 2) repeater amplifier can be obtained lo- cally. It can be inserted in the place of the TC4 18 1. The TC4180 Chassis holds five
5、 COA Modules and Eve TC4181 Repeater Amplifiers. To simplify installation and prevent installation errors, it has pre-wired connectors and two different sizes of card guides. It requires 3% inches of vertical space in a standard 19-inch rack; all of the required mounting hardware is included. This m
6、odel replaces the TC4 170 chassis. Additional Equipment If the TC4171 is to be connected directly to a central- office trunk, the trunk must terminate in an RJ 11 or RJ2 1X connector installed by the telephone company. Each TC4171 COA Module requires one Telecenter line. Additional Telecenter lines
7、are needed for key phones, extensions a console, and related equipment that will he connected to the Telecenter to answer outside calls. The number of lines needed depends upon the hardware to be installed and the software functions and options. If the racks mounting holes are not tapped, you will h
8、ave to obtain four #10 x self-tapping screws (e.g., Rauland WA102); if the holes are not protruded, obtain four #10 speed nuts (e.g., Rauland AB1889). The repeater amplifiers require 24-VDC power. The low-cost Rauland 6400 Power Supply can accommodate 10 TC4181s. The COAs derive their power from the
9、 Telecenter system. For details about wiring, programming, and FCC re- quirements, refer to the main Telecenter IV manuals, included in KI-1435, especially KI-1582 (Interconnect Planning and Installation) and RI-1584 (Programming), or to the Telecenter TCS planning and installation man- ual, KI-1539
10、, and programming manual, ICI-1538. Retrofit in TC4170 Chassis Since the card guides and connectors needed by the COA Module are already installed in the new, TC4180, Expander Chassis, they are no longer packed with the COA. However, if you need to add a COA Module to an older, TC4170, Expander Chas
11、sis, you will need to order these parts: Qty. Description 2 Card guide. 1 Card-edge connector, 30-pin wire-wrap. Polarizing key for the connector. #4 X 7 / 1 6 f hex washer-head thread-forming screw for attaching the connector to the TC4170. ID strip for the COA connector (already installed). Raulan
12、d Part No. QP0761-1 SFO506- %W38 WA216 QP0928 For installation instructions, consult IU-1457, the older TC4171 manual, which also covers the TC4170. False Calls (TC4171) In January 1987, resistor R3 was changed to 22 kilohms, and resistor R16 was changed to 680 ohms. These resistors were changed to
13、eliminate the triggering of false outside calls, which can occur when the central- office line is connected to the COA module with reverse polarity. If an older COA module (one shipped from Rauland before 1987) is involved in the triggering of false 01989 We are Borg . Printed in U.S.A. 8/89 Page 1
14、of 7 RadioFans.CN 收音机爱 好者资料库 Telecentet COA, Repeater Amp, and Chassis outside calls, check the polarity of the CO-line connection and change R3 and R16 to the new values. Incoming Calls The following components have been changed on all COA modules shipped after September 1988: Vl General Electric G
15、eneral Electric V270ZAO5 V220ZA05 These changes were made to eliminate the following problems: * Slow response (or none at all) to incoming calls. * When answering an incoming call, the operator would hear nothing, but the caller would hear con- tinual ringing. If an older COA module exhibits either
16、 of these problems, return it to the Factory for repair. FCC Approval A copy of the Federal Communication Commissions registration for the TC4 17 1 is attached. You may wish to consult it for the technical provisions and the Registration Number, which is required on some forms. Attachments IL0291 (M
17、echanical Installation). KM0946 (Wiring Diagram). KC1475 (Schematic for the TC4171). Parts for TC4180 Chassis Description Rauland Part No. # 10-32 x hex, SEMS, unslotted machine WA202 screw, for attaching the chassis to the rack. Locking bar, for holding the TC4171s and AB3628 TC4181s in the chassis
18、. Thread-forming screw, for attaching the WA5 locking bar to the chassis. ID strip for the COA connector. QP0928 Dress Panel and Mounting Hardware Dress panel. AN1058 #6-32 x pan-head slotted stainless-steel WA96 screw. #6 flat stainless steel washer. WJ0074 #6-32 U nut. AB2904 Installation Importan
19、t 1. Any lines that go outside of the building, in- cluding central-office lines, must have lightning protection-see the LP” details on KM0716 and the appropriate Telecenter manual. 2. If the TC4181 Repeater Amplifiers are used, make sure that the negative side of the connec- tion to the power suppl
20、y is jumpered to a Z terminal on the Telecenter (see KM0946). Failure to provide this grounding could result in severe crosstalk. 3. Be sure to cut Pin 3 of the LLM “Ul” line hybrid used by each COA module (see step 3 of KM0716). Removing this pin prevents ring volt- age from reaching, and damaging,
21、 the COA. Note: Capacitor C4 is the component most like- ly to be damaged by ring voltage. Initial Mechanical Step 1. Orient the Expander Chassis horizontally, will the rack-mounting ears to the front. The tabs for the locking bar should be on top, and the left-most card guides should be the larger
22、ones used for the repeater amplifiers (see IL029 1). Step 2. Locate the two vertically centered tabs used for mounting the front panel. Push a #6-32 “U” nut, flat side facing outward, on each of these tabs. Step 3. Fasten the chassis to the rack with the four #10 machinescrews. Note: If the racks mo
23、unting holes are not tapped, obtain the self-tapping screws speed nuts listed earlier under “Additional Equipment.” Step 4. Before installing the TC4171 modules, make sure that the jumper to the left of the transformer is set to match the impedance of the central-office lines (typi- cally 900 ohms)
24、or PBX lines (typically 600 ohms). To change the setting, simply pull the jumper connector off, then push it onto the center pin and the pin with the desired value (6OO” or “900”). Step 5. Working from the front of the chassis, insert the TC4 17 1 modules into the slots with the smaller card guides;
25、 the component side should face to the right (as viewed from the front of the chassis). Step 6. Working from the front of the chassis, insert the TC4181 amplifier modules into the slots with the larger card guides; the component side should face to the left (as viewed from the front of the chassis)
26、and the printing on the face plate should be right-side-up. Step 7. Complete all wiring, programming, and testing (see the attached KM0946 and the appropriate Telecenter manuals). Note that the wiring between the connectors has already been done by the factory. RadioFans.CN 收音机爱 好者资料库 Step 8. Label
27、each module pair with both the central- office or PBX number and the Physical Number of the Telecenter line. Check the gain of the repeater amplifiers; make any necessary adjustments. Complete the installa- tion by doing the final mechanical assembly. Amplifier Gain Adjustment FCC standards require
28、that a system not produce any net gain between approved telephone instruments and C.O. interface terminals. Although the TC4 181 is designed to have a slight net loss, the following procedure is provided as a means of verifying and adjusting system gain if necessary. You will need: A dial phone that
29、 will produce a pure tone (941 Hertz) when you simultaneously press any two or all three buttons in the bottom row. Alternatively, use any dialing phone plus an oscillator with a special network that maintains line balance and impedance. A meter with which you can measure decibels. To make an adjust
30、ment, you will need quarter-watt resistors with values like those in the table for Step 4; a substitution (decade) box would also prove helpful. Step 1. Place the telephone next to the Telecenter system, then establish communications between it and another telephone: the second phone may be inside o
31、r outside the Telecenter system; what is essential is that the connection be made via the trunk you want to test (e.g., get central-office dial tone via the trunk, then call back into the system by dialing the appropriate seven-digit number used by outside callers). To select a particular trunk for
32、dialing out, make sure that it is available, then dial its Architectural Number instead of “9.” Keep both phones off-hook. Step 2. While you measure the trunk you are testing (1) across T and R on the LLM, then (2) CT and CR on the COA, hold in any two or all three buttons on the telephones dial pad
33、 (or use an oscillator, as described in the first check-marked paragraph at the beginning of the “Amplifier Gain Adjustment” section). To make sure that you are measuring the DTMF tone and not noise or DC current, release the dial buttons: the meter reading should drop appreciably. Mark down the rea
34、ding for each tone measurement (LLM and COA) . Telecenter COA, Repeater Amp, and Chassis Important: 1. If you are using another Telecenter line for receiving, make sure that you are measuring the trunk you are calling out on: the tones returning on the other line should be considerably lower, becaus
35、e of losses through the central-office lines. Note: You can estimate the amount of gain by talking to someone on the other phone as you plug and unplug the repeater amplifier at the chassis (the chassiss amp connectors have shorting contacts so that the COA module will continue working when there is
36、 no repeater amplifier). 2. A positive gain of 1.76 dB is permissible when the central-office line is 900 ohms and the COA is connected via its 9oo-ohm tap. This higher voltage level will produce the same power level on a 9OO-ohm line as the regular voltage level would on a standard 6OO-ohm line: 10
37、 log (900/600) = 1.76 Step 3. (a) If the levels are satisfactory, skip to the final mechanical assembly. (a) If there is excessive gain, continue with Step 4. Step 4. (a) If tbe gain is five or more decibels, remove the repeater amplifier. (b) If the gain is from one to four decibels,reduce it by in
38、stalling a quarter-watt resistor acrossCOA Terminals A2 andA4. You will have to experiment to find the exact value needed (a load box would prove helpful here). The fol- lowing table suggests the approximate values that you will need: Desired Reduction Resistor Value 1dB 3.3 Kn 2dB 1.5 m 3dB 1m 4dB 6800 Final Mechanical Step 1. Orient the locking bar as shown in IL0291 and secure it with the two #6 x thread-forming screws. Step 2. Install the dress panel, using the #6 pan-head Phillips screwsand flat washers; be careful not to mar the panel.
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