minature v.34 telephone line interface xe0055s & xe0055t 1-11-96 features * small size: xe0055s1/t1 1.5" by 0.5" by 0.280"; XE0055S2/t2 1.5" by 0.5" by 0.230"; * v.34 compatible for data transfer to 28,800 bps; * fcc part 68 compliant; * pin compatible replacement for xecom's xe0054sip * ring detection; * single power supply, 3 to 5 volts; * hookswitch control * two mechanical variations xe0055s1/t1 vertical mount XE0055S2/t2 - horizontal mount description the xe0055s and xe0055t are very slim telephone interface modules. they support v.34 communications at 28,800 bps, yet are no more than 0.290 inches thick and comply with fcc part 68 rules for connection to the public telephone network. the xe0055s and xe0055t differ only in their ring indicate outputs. the xe0055s provides an integrated ri output. it remains low while ring is present. the xe0055t's ri output is not integrated. it provides a pulse train at twice the ring frequency. xecom offers two mechanical variations of the xe0055s and xe0055t. the xe0055s1 and xe0055t1 mount vertically to consume minimal board space. the XE0055S2 and xe0055t2 mount horizontally for the lowest possible profile. both versions have the same pin out and are electrically identical. the xe0055s operates from a single power supply from +3 to +5 volts. as with all xecom telephone interface modules, internal ring indication and switch hook are provided. xecom
mechanical specifications
3/xecom xe0055s&t pin descriptions pin name description 1 ring ring is one of two signals which form the telephone network connection (rj11 pin 4). this device is not sensitive to the polarity of the battery voltage on the telephone line. ring has 1500 volts isolation from the rest of the circuitry. this isolation must be preserved throughout the system. 2 tip tip provides the second connection to the telephone network (rj11 pin 3). tip has 1500 volts isolation from the rest of the circuitry. this isolation must be preserved throughout the system. 3 oh hook-switch relay control. a high on oh closes the internal relay and connects the equipment to the telephone line. 4 t1 t1 connects directly to the secondary side of the xe0055s telephone line transformer. 5 gnd this signal is used as common reference for all of the control signals in the xe0055s. signals on t1 and t2 are not referenced to ground. 6 vcc vcc provides the power source for the hook-switch control. the xe0055s will operate with vcc equal to 3 to 5 volts 7 t2 t2 connects directly to the secondary side of the telephone line transformer of the xe0055s 8 /ri ring indicate, output, active low ttl. ri goes low on the xe0055s with each ring and remains low as long as the ring is present on the telephone line. the xe0055t ri output provides a pulse at twice the ring frequency. 1 o 2 o 3 o 4 o 5 o 6 o 7 o 8 o pin configuration xe0055s & xe0055t ring tip oh t1 gnd vcc t2 /ri (top view)
electrical specification (vcc=+3v , ta=0 to 70 deg c) power supply current off hook 6 10 ma transmit insertion loss 600 ohm impedence, 1000 hz 1.7 2.7 3.7 db receive insertion loss 600 ohm impedance, 1000 hz 1.7 2.7 3.7 db line impedance at 1000 hz, rm 590 ohms 540 600 660 ohms coupler match input impedence to t1 & t2 336 340 344 ohms input impedence ring detect min. ac voltage between tip & 38 150 vrms sensitivity (on-hook) ring type b ringer ring detect ringing voltage of 40 vrms 100 ua peak current applied between tip & ring ring detect no ringing voltage present 10 ua idle current ring indicate output ring voltage present on tip 0.2 0.5 volts voltage & ring loop current switch on: (off-hook) 2.0 2.5 volts control voltage off: (on-hook) 0.2 0.5 volts loop current switch 15 25 ma control current loop current off-hook current draw from 20 100 ma telephone line total harmonic at 1800 hz, -9 dbm signal level -72 -76 dbm distortion parameter conditions min typ max units xe0055s&t xecom/4
absolute maximum ratings storage temperature -25 o c to +85 o c operating temperature range 0 o c to +70 o c maximum lead temperature 260 o c (soldering 2 seconds per wave) 5/xecom xe0055s&t xe0055s typical connection diagram
xe0055s &t xecom/6 converting from xe0054sip to xe0055s
telephone line connection information when developing a product to be connected to the telephone line, it is necessary to use a circuit described as a data access arrangement (daa) which is approved by the appropriate governmental agency. in the us, for example, this agency is the federal communications commission (fcc), while in canada it is the department of communications (doc). 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 xe0055s and xe0055t were designed to meet all fcc part 68 requirements for hazardous voltage, surge protection and leakage current. if the system developed transmits data, or dtmf tones on the telephone line, the user must certify that the signals transmit meet basic fcc requirements for maximum transmission levels of 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 ?ermissive?(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 ?ut of band?energy on the telephone line which exceeds the following limits: frequency range max. power 200hz to 3990hz -9 dbm 3990hz to 4005hz -27 dbm 4005hz to 16khz -16 dbm 8khz to 94khz -47 dbm 86khz to 270khz -46 dbm 270khz to 6mhz -6 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 xe0055s or xe0055t is taken ?ff 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. the user of the xe0055s or xe0055t 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 isolation provided by the daa module. this is generally accomplished through an independent testing lab which test the system and submits the proper paperwork to the fcc for approval. since the xe0055s and xe0055t already comply with fcc part 68 rules, this is a relatively simple proces s. 7/xecom xe0055s&t
copyright, xecom ?1996 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 trademarks and/or registered trademarks of their respective companies. x e c om incorporated 374 turquoise st r e e t , m i l pitas, ca 95035 ph:408 -945 -66 40 fax: 4 0 8 - 9 4 2 - 1 3 46 e-mail info@xecom.com xecom 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 provided 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 reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
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