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xecom xe014js plcc daa for shared-line applications xe014js 10-99 figure 1: xe014js block diagram line trans- former line current holding cir- cuit hookswitch ring de- tector t1 t2 oh(+) ri(+) tip ring handset interrupt circuit /hint /cd connect detect monitor description xecoms xe014js is a complete daa integrated into a compact plcc package. the xe014js incorporates features which permit equipment to share a host telephone line. the plcc package reduces the daa space requirements and permits automated, high-volume assembly. the xe014js is targeted for remote monitoring equipment which shares a host telephone line such as set top boxes and automated utility meters. the xe014js includes a pair of circuits which prevent the equipment from interfering with host calls. the connect detect circuit monitors line activity and indicates when the host telephone line is in use. by monitoring this signal the equipment avoids interruption of a host call in progress. the handset interrupt circuit monitors the host telephone line for interruptions while the equipment is on-line. this permits the equipment to drop the call in progress if the host picks-up the telephone line. like all xecom daa's the xe014js is a complete telephone line interface. it includes the telephone line transformer, line current holding circuit, hookswitch and ring indicator. the xe014js replaces the dozens of components found in a discrete design with a complete, tested solution. features * package: 68-pin plcc (only 18 pins used) 0.952 inches by 0.952 inches by 0.170 inches high * integrated telephone line transformer * integrated ring detection with active high and active low ouput signals * operates on a single power supply of +5 volts; * solid-state hookswitch control with active high and active low inputs; * integrated connect detection monitor; * integrated handset interrupt circuit; * fcc part 68 compliant; * extended temperature range available; oh(-) ri(-) dc2 dc1
xecom (2) xe014js figure 2: xe014js pin configuration 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 ri(-) ri(+) oh(+) t1 t2 n/c oh(-) vcc gnd n/c ring tip n/c n/c n/c n/c /hint /cd xe014js (top) pin descriptions pin name description 1 n/c no connection 2 ring ring is one wire of the two-wire telephone line connection (rj11 pin 4). fcc part 68 rules require a 1500 volt isolation barrier between the telephone line and all other circuits. this isolation must be preserved throughout the system. xecom recommends 0.100 inch spacing between traces connected to ring and all other conductors to preserve this isolation. 3 tip tip is one wire of the two-wire telephone line connection (rj11 pin 3). the telephone company places a dc "battery" voltage across tip and ring on all public switched telephone lines. the xe014js accepts this line battery voltage without regard to its polarity. 4-7 n/c no connection 8 /hint handset interrupt provides an active low output to indicate when another piece of equipment goes off- hook on the shared telephone line. when the xe014js detects a drop of at least one volt in the dc line voltage, /hint goes low for two to six seconds to notify the host equipment that the is required by other equipment. the host equipment is responsibel for deactivating the oh line to return the xe014js to the on-hook state. 9 /cd connect detect is an active low output which indicates that the local telephone line is available for use. /cd remains active as long as the dc line voltage remains above 36 volts. 10 gnd ground connection to the xe014js. this signal provides the reference for the oh output and ri input. this pin should be connected to the systems digital ground. 11 vcc +5 volt power source for the xe014js. vcc powers the ri and oh control lines. 12 oh(-) modem switch-hook control: oh(-), an active low input, for controls the switch hook in the xe014js. when the host activates pin 12, the switch-hook closes and the xe014js seizes the local telephone line. pin 16 provides an active high switch-hook control. oh(-) should remain open when using oh(+). the host can pulse oh(-) line to perform rotary dialing. the normal pulse rate is ten pulses per second. closing the switch-hook creates a series of pulses. dial one pulse for the digit one to ten pulses for the digit zero. the pulses on oh(-) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty-nine milliseconds. an inter-digit delay of at least one hundred milliseconds is required.
pin descriptions pin name description 13 n/c no connection 14 t2 t2 in conjunction with t1 provides the differential input/output for the analog signal. t2 connects directly to the secondary side of the miniature line transformer embedded into the xe014js. to match the impedance of the daa to the 600 ohm telephone line, a 340 ohm resistor must be connected in series with t1 or t2. 15 t1 t1 in conjunction with t2 provides the differential input/output for the analog signal. t1 connects directly to the secondary side of the miniature line transformer embedded into the xe014js. to match the impedance of the daa to the 600 ohm telephone line, a 340 ohm resistor must be connected in series with t1 or t2. 16 oh(+) switch-hook control to the modem. oh(+) provides an active high input for controlling the switch hook. when pin 16 is active, the switch-hook closes and the xe014js seizes the local telephone line. oh(+) should remain open when using oh(-). the host can pulse oh(+) line to perform rotary dialing. the normal pulse rate is ten pulses per second. closing the switch-hook creates these pulses. dial one pulse for the digit one to ten pulses for the digit zero. the pulses on oh(+) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty- nine milliseconds. an inter-digit delay of at least one hundred milliseconds is required. 17 ri(+) ring indicate output from the modem. ri(+) is an active high output. ri(+) provides a square wave representation of the ring signal present across tip and ring. this permits intelligent monitoring of the incoming ring. the xe014js recognizes ring voltages of thirty-eight to one hundred fifty volts rms in the frequency range of sixteen to sixty-eight hertz. when using ri(+), a 20k pull-down resistor is required on pin 17 and pin 18, ri(-), must be tied to ground. 18 ri(-) ring indicate output from the modem. ri(-) is an active low output. ri(-) provides a square wave representation of the ring signal present across tip and ring. this permits intelligent monitoring of the incoming ring. the xe014js recognizes ring voltages of thirty-eight to one hundred fifty volts rms in the frequency range of sixteen to sixty-eight hertz. when using ri(-), a 20k pull-up resistor is required on pin 18 and pin 17, ri(+), must be applied to vcc. xecom (3) xe014js
xecom (4) xe014js electrical specification (vcc=+5v 10%, ta=0 to 70 deg c) power supply current off-hook 10 ma on-hook 1.0 ma transmit insertion loss 600 ohm impedance, 1800 hz 4.4 5.4 6.4 db receive insertion loss 600 ohm impedance, 1800 hz 4.4 5.4 6.4 db line matching impedance input to t1 and t2 320 340 360 ohms line impedance 340 ohm matching impedance resistor 540 600 660 ohms total harmonic distortion 600 ohm impedance, 100 to 4000 hz -76 -80 db ring detect sensitivity min. ac voltage between tip & 20 150 vrms ring type b ringer ring frequencies detected 16 68 hz ri output voltage ring signal present, active low 0.2 0.5 volts ring signal present, active high 2.0 5.0 volts hook-switch control on: (off-hook) 0.2 0.5 volts voltage (active high) off: (on-hook) 2.0 3.0 volts hook-switch control on: (off-hook) 2.0 3.0 volts voltage (active low) off: (on-hook) 0.2 0.5 volts hook-switch control on: (off-hook) 5 10 milliamps current off: (on-hook) 5 microamps loop current no connection from dc1 to dc2 20 100 ma (current draw from line) dc1 shorted to dc2 10 60 dc on-hook impedance hookswitch open 10 mohms connect detect threshold on-hook 36 volts dc handset detect threshold off-hook d 1 volts dc parameter conditions min typ max units
mechanical specifications xecom (5) xe014js a a1 d3 a h x 45 degrees (3 places) d2 b e d1 d1 d index corner j x 45 degrees inches millimeters dim min ref max min ref max a 0.170 4.32 a1 0.020 0.51 b 0.017 0.021 4.32 5.33 d 0.985 0.995 25.0 25.27 d1 0.952 24.18 d2 0.800 20.32 d3 0.910 0.930 23.1 23.62 e 0.100 2.54 h 0.010 0.25 j 0.045 1.15 a45 o 45 o coplanarity 0.004 0.10 (top) 10 1 9 (bottom) xe014js absolute maximum ratings storage temperature -25 o c to +85 o c operating temperature range * 0 o c to +70 o c * the xe014js can be ordered with an operating temperature of -40 o c to +85 o c at extra cost. order XE014JS-ITR to specify industrial temperature range (itr).
xecom (6) xe014js xe014js soldering instructions because of its hybrid construction, the xe014js plcc daas are subject to damage if over-exposed to heat during solder reflow operations. following the soldering instructions below will ensure that the process of soldering the module to the board does not damage the daa. maximum temperature 220 o c maximum time at 220 o c 20 seconds maximum time above eutectic (180 o c) 90 seconds maximum preheat dwell time 180 seconds notes: because of their large black bodies, xecoms xe014js daa modules must not be exposed to direct infrared ray (ir) heating. if your process includes direct ir heating, you must shield the plcc daa module from the infrared rays. xecoms plcc daa modules should be exposed to no more than one reflow c ycle. maximum recommended solder profile 220 o c 180 o c 150 o c 180 sec -20 sec- max max ----- 90 sec max -----
xecom (7) xe014js typical connection diagram rj11 1 ri(+) 18 2 ring ri(-) 17 3 tip oh(+) 16 4 t1 15 5 t2 14 6 13 7 oh(-) 12 8 /hint vcc 11 9 /cd gnd 10 xe014js ringd txa1 rin txa2 +5v fb1 fb2 rv1 340 ohms rc224atf -oh notes on application schematic : c1 and c2 are 47 picofarad 1500 volt capacitors provided for emi filtering. high voltage capacitors are required to maintain the isolation barrier between the telephone line and the host equipment. fb1 and fb2 are ferrite beads. they provide emi filtering. they should present an impedance of at least 100 ohms at 100 mhz. rv1 protects the xe014js from voltage surges generated by near lightning strikes. xecom recommends a teccor electronics p3100ba70 sidactor. this device has a typical breakover voltage of 300 volts. the 340 ohm resistor between t1 and txa1 provides the optimal resistance for the xe014js to match the impedance of a standard 600 ohm line. c1 c2 interrupta interruptb +5v 20k
xecom (8) xe014js application notes dialing: the public switched telephone network permits tone and rotary (pulse) dialing. the xe014js supports both types of dialing. tone dialing requires an external signal source to provide the dialing tones. rotary dialing is accomplished by pulsing the oh or mute line on the xe014js. pulse dialing: the xe014js generates dialing pulses through momentary closures of the switch-hook. each digit is represented as a series of pulses, one pulse for a one to ten pulses for a zero. the pulse rate is ten pulses per second. the dialing pulses are asymmetrical. an interdigit delay of at least one hundred milliseconds separates the digits. tone dialing: to tone dial the xe014js seizes the line, oh active. for each digit a unique dtmf, dual tone multiple frequency, tone pair is placed across t1 and t2. the higher frequency tone is always of greater magnitude than the lower frequency tone. transmit the tones for a minimum of 70 milliseconds, and leave a minimum of 70 milliseconds be- tween digits. the table below shows the correct dtmf signal frequencies for each digit. digit lower t one upper t one 1 697 1209 2 697 1336 3 697 1477 4 770 1209 5 770 1336 6 770 1477 7 852 1209 8 852 1336 9 852 1477 0 941 1336 * 941 1209 # 941 1477 signal levels: fcc part 68 rules set the allowable signal level in the us for all signals placed on the telephone line other than live voice. other countries have similar regula- tions. signal levels are measured in dbm. zero dbm is 1 milliwatt through a 600 ohm load. insertion loss: there is some loss of signal power as the information signal passes through the xe014js. this "inser- tion" loss should be taken into account when placing signals across t1 and t2 for transmission. the typical insertion loss of the xe014js is 2.7 dbm.
xecom (9) xe014js xe014js 2/4 wire conversion: full duplex communications over a two-wire telephone line requires that transmit and receive signal share the available bandwidth. the two-to-four wire convertor separates these signals at the host interface. most modem analog front end chips incorporate an internal 2/4 wire convertor making it unnecessary to provide one in the daa. if you are using the xe014js for an application other than a modem, such as voice processing, or your modem analog front end does not provide the 2/4 wire convertor, you will need to provide a discrete 2/4 wire convertor. the schematic on this page shows a simple 2/4 wire convertor circuit. the performance of the 2/4wire convertor is measured by its transhybrid loss. the transhybrid loss shows how much the 2/4 wire convertor attenuates the transmit signal on the received data line. the circuit above provides a typical transhybrid loss of 20 db. the transhybrid loss will vary with the quality of the impedance match to the telephone line. even when the recommended value for the impedance matching resistor, r6, is used variations from line to line alter the impedance match. the value of r3 can be changed to improve the transhybrid loss. the 2/4 wire convertor also amplifies the transmit and receive signals to compensate for the insertion loss of the daa. this circuit provides 6 db gain of both the transmit and receive signals. the values of r1 and r2 set the transmit gain. the values of r4 and r5 set the receive gain. 2/4 wire convertor r6 r2 r1 r3 r4 r5 4558 4558 10k 11.5k 40k 340 ohms 20k t1 t2 transmit receive
xecom (10) xe014js telephone line connection information when developing a product to be connected to the telephone line, it is necessary to use a circuit known as a data access arrangement (daa) approved by the appropriate governmental agency. in the us this agency is the federal communications commission (fcc), while in canada it is industry canada (ic). these agencies test and approve the product to ensure that it meets their specifications, thereby protecting the telephone system from damage and protecting the user from high voltage transients (such as lightning strikes) which may come down the telephone line. the xe014js has been designed to meet all fcc part 68 requirements for hazardous voltage, line impedance and leakage current. if the system transmits data, synthesized voice, or dtmf tones on the telephone line, the user must certify that the signals transmitted meet basic fcc requirements for maximum transmission levels, out of band energy and billing delay. full details may be obtained from the fcc under part 68 of the fcc rules and regulations, or in title 47 of the code of federal regulations, however the basic requirements are as follows: 1. maximum transmit level for the normal permissive (standard) telephone line, equipment which transmits data (such as a modem) must not exceed a transmission level of -9 dbm. 2. out of band energy data equipment must not transmit out of band energy on the telephone line which exceeds the following limits: frequency range max. power 3995 hz to 4005 hz -27 dbm 4005 hz to 12 khz -20 dbm 12 khz to 90 khz -55 dbm 90 khz to 270 khz -55 dbm 270 khz to 6 mhz -15 dbm 3. dtmf transmission level if the system is capable of dtmf dialing, the maximum dtmf transmission level must be less than 0 dbm averaged over a 3 second interval. 4. billing delay a delay of 2 seconds or greater is required after the time the xe014js is taken off hook and before any information is transmitted. this is required to ensure that billing information may be exchanged between telephone company central offices without interference. oems using the xe014js must certify to the fcc that the final system meets the requirements of part 68 which include the criteria above as well as the high voltage protection provided by the xe014js. this is generally accomplished through an independent testing lab which tests the system and submits the proper paperwork to the fcc for approval. since the xe014js already complies with fcc part 68 rules, this is a relatively simple process.
xecom xe014js copyright, xecom ? 1999 while xecom, inc. has made every effort to ensure that the information presented here is accurate, xecom will not be liable for any damages arising from errors or omission of fact. xecom reserves the right to modify specifications and/or prices without notice. product mentioned herein are used for identification purposes only and may be trade- marks and/or registered trademarks of their respective companies. xecom incorporated 374 turquoise street, milpitas, ca 95035 ph:408-945-6640 fax:408-942-1346 email: info@xecom.com terms of sale devices sold by xecom are covered by the warranty provisions appearing in its terms of sale only. xecom makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the described devices from patent infringement. xecom makes no warranty of merchantability or fitness for any purposes. xecom reserves the right to discontinue production and change specifications and prices at any time and without notice. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by xecom for such application. xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a xecom product. no other circuits, patents, or licenses are implied. life support policy xecom's products are not authorized for use as critical components in life support devices or systems. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions pro- vided in the labeling, can be reasonably expected to result in significant injury to the user. a critical component is any component of a life support device or system whose failure to perform can be rea- sonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.

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