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xecom (1) xe5620 xe5620 january 2003 56 kbps surface-mountable integrated sealed-hybrid modem description xecom?s xe5620 provides a complete 56 kbps modem into an miniature, surface-mount package. xecom?s new hyplcc? package (hybrid plcc) makes it possible to meet the conflicting goals of small size, low cost and surface-mountability. the xe5620 targets remote monitoring applications in industrial, commercial and residential locations as a complete modem, the xe5620 includes not only all modem circuitry but also user transferrable fcc part 68 registration and ul60950 recognition. this allows the xe5620 to be easily integrated into your embedded application. xecom?s new hyplcc? package infuses the xe5620 with both its small size and surface mountability. the hyplcc package allows complex hybrid circuits to fit the 68-pin plcc footprint. the hyplcc? package provides a completely sealed environment protecting the xe5620 during assembly and board cleaning operations. xecom also provides a low speed model, the xe2420, in the hyplcc? package. features * small size: the hyplcc? measures less than 1 inch by 1 inch square and 0.290 inches thick * surface-mountable: the hyplcc? package is equivalent to a 68-pin plcc device. * data transfer at all rates from 300 bps to 56kbps using v.90, v.34bis, v.34, v.32bis, v.32, v.22bis, v.22, v.23, v.21, bell 212a, and bell 103 protocols * supports v.42 error correction and v.42bis data compression * modem control and configuration via industry standard at commands. * non-volatile memory stores modem configuration and permits stored number dialing. * incorporates fax send and receive capabilities controlled by class 1 fax commands. * complete integrated daa includes, ring detect, loop current holding circuit, hook switch. metallic surge protection, and solid-state daa * user transferrable fcc part 68 registration * ul60950 recognition * low power operation, 3.3 volts, 300 milliw att; xe5620 block diagram
xecom (2) xe5620 xe5620 mechanical specifications a b c d c f g e e 45 o i (top) inches millimeters dimension min typ max min typ max a 0.280 0.285 0.290 7.11 7.24 7.37 b 0.985 0.990 0.995 25.02 25.15 25.27 c 0.950 0.955 0.960 24.13 24.26 24.38 d 0.910 0.920 0.930 23.11 23.37 23.62 e 0.045 0.050 0.055 1.15 1.27 1.40 f 0.695 0.700 0.705 17.65 17.78 17.91 g 0.195 0.200 0.205 10.03 10.16 10.29 i(radius) 0.015 0.020 0.025 0.13 0.25 0.38 i i .050?
xecom (3) xe5620 xe5620 pin configuration pin descriptions pin name description 1 /dcd /dcd is an active low output from the modem. the at&c command controls when the xe5620 asserts /dcd. 2 /cts /cts is an active low output from the modem. the modem asserts /cts to indicate that it can accept data from the terminal equipment on /txd. 3 /reset reset is an active low input which initiates a modem hardware reset. reset must be active for a minimum of 100 milliseconds for a proper modem reset sequence. no external reset is required; if none is used the reset signal should be left open. 4 /dsr /dsr is an active low output from the modem. the at&s command controls when the xe5620 asserts /dsr. 5 /rts /rts is an active low input to the modem. /rts indicates to the modem that the host has data to send. 6 /dtr /dtr is an active low input to the modem. the at&d command determines how the modem will interpret activity on /dtr. 7 /rxd /rxd provides the path for received data and modem responses to be sent from the modem to the host terminal equipment. /dcd 1 /cts 2 reset 3 /dsr 4 24 ring /rts 5 23 n/c /dtr 6 22 tip /rxd 7 21 n/c /txd 8 20 n/c /ri 9 19 np gnd 10 18 np spkr 11 17 np n/c 12 16 np n/c 13 vcc 14 n/c 15 top
xecom (4) xe5620 8 /txd /txd provides the path for transmitted data and modem commands to be passed from the host terminal equipment to the modem. 9 /ri the /ri signal reports on the presence of an incoming ring signal. when a ring occurs across tip and ring, the /ri output goes low and toggles with the cadence of the ring signal.. 10 ground ground provides the reference voltage for all host interface signals. 11 spkr spkr allows connection of a speaker to monitor modem operations. spkr cannot directly drive a speaker. an amplifier with a minimum input impedance of 300 ohms is required. the signal on spkr is controlled by the atl and atm commands. 12-13 n/c no internal connection 14 vcc vcc provides 3.3 volt power to the modem. 15 n/c no internal connection 16-19 np no pin 20-21 n/c no internal connection 22 tip the ring and tip signals provide modem the connection to the telephone line. 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. the telephone company places a dc ?battery? voltage across tip and ring on all public switched telephone lines. the xe5620 will operate regardless of the polarity of this ?battery? voltage. the ?battery? voltage drives up to 100 milliamps of dc loop current. ul60950 requires minimum creepage and clearances distances be maintained between the tip and ring traces and all other circuits. clearance is the shortest distance between conductive circuits; creepage is the distance between conductive surfaces along the surface 23 n/c no internal connection, to prevent damage in case of voltage surges on the telephone line, we recommend that nothing be connected to this pin. 24 ring the ring and tip signals provide modem the connection to the telephone line. 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. the telephone company places a dc ?battery? voltage across tip and ring on all public switched telephone lines. the xe5620 will operate regardless of the polarity of this ?battery? voltage. the ?battery? voltage drives up to 100 milliamps of dc loop current. ul60950 requires minimum creepage and clearances distances be maintained between the tip and ring traces and all other circuits. clearance is the shortest distance between conductive circuits; creepage is the distance between conductive surfaces along the surface. xe5620 pin descriptions (continued) pin name description
xecom (5) xe5620 xe5620 soldering instructions the xe5620 is 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 modem. the xe5620 must not be exposed to direct infrared (ir) heating. if your process includes direct ir heating, you must shield the xe5620 from the infrared rays. 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 maximum recommended solder temperature profile 220 o c 180 o c 150 o c -20 sec- --------------------------------180 sec max --------------------- max ----- 90 sec max -----
xecom (6) xe5620 xe5620 electrical specifications vcc 3.13 3.3 3.47 volts icc 85 90 100 ma on line icc 25 ma on-hook ring voltage detected 26 150 vrms type b ringer ring frequency detected 15.3 68 hz type b ringer telephone loop current 10 40 100 ma line impedance 600 ohms data transmit level -12.0 -9.0 dbm dtmf transmit level -2.5 0 dbm avg over 3 second interval voh 2.4 volts vol 0.4 volts vih 2.0 vcc+0.3 volts vil -0.3 0.8 volts parameter min typ max units comments xe5620 absolute maximum ratings storage temperature -25 o c to +85 o c operating temperature range 1 0 o c to +70 o c maximum time above eutectic (183 o c) 90 seconds preheat dwell time 120 to 180 seconds 1 the xe5620 can be ordered with an operating temperature of -40 o c to +85 o c at extra cost. order XE5620-ITR or to specify industrial temperature range (itr).
xecom (7) xe5620 xe5620 typical connection diagram notes: 1 fb1 and fb2 are ferrite beads which may be required for emi filtering in your system. without these components you may experience unintended radiation when the telephone cable is attached. we recommend selecting components such as the tdk acb2012l-120 which provide a minimum of 100 ohms of impedance at frequencies above 100 mhz. 2. c1 and c2 are high-voltage capacitors which may be required for emi filtering in your system. without these components you may experience unintended radiation when the telephone cable is attached to your system. we recommend selecting components such as the panasonic eckdrs471. this 470 pfd, 3000 volt capacitor will direct the high frequency harmonics to the system ground. these capacitors must be rated at a minimum of 1500 volts to maintain the isolation required by fcc part 68 rules. 3. f1 and f2 are positive thermal coefficient (ptc) devices which protect the modem form excessive current flow. these devices are required for your system to pass ul60950. fuses may be used in place of the ptc?s parts list for xe5620 typical connection diagram reference reference designation qty description designation qty description c1, c2 2 cap. 470 pfd 2600v fb1, fb2 2 ferrite, acb2012l-120 c3 1 cap. .1 ufd 20% 16v ls1 1 speaker, 8 ohms c4 1 cap. .1 ufd 20% 16v r1 1 potentiometer, 10k c5 2 ferrite, acb2012l-120 r2 1 resistor, 10 ohms 20 % f1, f2 2 ptc, tr600-150 u1 1 national semi lm386
xecom (8) xe5620 application note: using a 68-pin plcc socket the xe5620 can be inserted into a socket for a 68-pin plcc device. the hyplcc package uses only 20 pins; 15 on one side and 5 on the opposite side. alignment within the socket is critical for all pins of the xe5620 to make contact with the appropriate pins of the plcc socket. the drawing below illustrates how the xe5620 can be inserted into the 68-pin plcc socket. emulation technology?s s-smt-17-068-a socket is representative of sockets that can be sued with the xe5620. 60 44 61 43 1 9 27 10 26 xe5620 1 2 3 4 24 5 23 6 22 7 21 8 20 9 19 10 18 11 17 12 16 13 14 15
xecom (9) xe5620 the xe5620 uses "at" commands for configuration and control. this section describes the at command format and lists the at commands, registers and result codes. xe5620 "at" commands have two operational modes; command mode, data mode and fax mode. data mode: the xe5620 enters data mode after it connects to a remote modem and issues the appropriate result code. in the data mode the modem sends all data presented on transmit data (/txd) to the remote modem and puts data from the remote modem onto received data (/rxd). when the modem exits data mode, it issues a "no carrier" result code. command mode: the xe5620 enters command mode on power-up, reset, a lost connection, or receipt of the escape code. in command mode the modem accepts commands from the host on transmit data. appropriate result codes are returned on received data. fax mode: the xe5620 enters class 1 fax mode on receipt of at+fclass=1. in fax mode commands and responses are issued at 19,200 bits per second; the character format is 8 bits no parity. the modem accepts fax commands only in fax mode. the a/, ato, at&t and escape commands are not valid in fax mode. command line format command lines issued to the modem follow a strict format. each command begins with the prefix at. the command buffer stores the command line and executes it upon receipt of a carriage return. until executed, the command line can be edited with the backspace key. command prefix - each command, except the a/ command, begins with the at prefix. the "a" and "t" may be both upper case or both lower case but cannot be of different cases. the prefix identifies the speed and parity of the commands sent to the modem. the modem deternies data rate by measuring the width of the incoming bits. parity is determined by comparing the parity bits of the "a" and the "t." xe5620 at commands command line - commands may be strung together in a single command line of up to 36 characters. com- mands are executed in the sequence they appear. spaces may be inserted into the command line but do not fill space in the command buffer. a carriage return termi- nates the command line and causes the commands to be executed. register s3 allows the user to select a character other than a carriage return to terminate the command line. command buffer - the command buffer holds a maximum of 36 characters, including the at prefix. if the command buffer overflows, the modem issues an "error" result code and commands are not executed. command line editing - the backspace edits a command line before it is executed. the backspace key, (control and h simultaneously on some systems), erases the previous character in the command line. register s5 allows the user to select a character other than a back- space to edit the command line. re-execute last command - the a/ command causes the modem to re-execute the last command line. this is the only command which does not require the "at" prefix. omitted parameters - most commands include a pa- rameter which determines how the functions will be set. when the command parameter is omitted from the command string, it is assumed to be a 0. escape characters - a 3 character escape sequence may be entered to switch the modem into command mode while on line. the escape character, set by register s2, must be entered 3 times in succession to execute the escape. an at command must then be entered within the period defined by s12 to enter command mode. the default escape sequence is "+++." result codes - the modem issues a result code after each action. result codes may be sent as full words, one or two digit numeric codes, or may be disabled all together. each result code ends with a carriage return when numeric result codes are chosen. when full word result codes are chosen, a line feed and carriage return precede and follow each result code.
xecom (10) xe5620 xe5620 at commands an asterisk indicates the factory default a - answer command - bn - select communications standard n=0 selects ccitt standards * n=1 selects bell standards d - dial command - 0-9, a-d, #, * = dialing digits p = pulse dial t = tone dial w = wait for dial tone , = pause for the duration of s8 @ = wait for silence ! = switch hook flash ; = return to the command state ^ = enable calling tone s=n = dial stored number n en - command echo n=0 do not echo commands n=1 enable command echo* hn - switch hook control - n=0 switch hook relay opens n=1 switch hook relay closes in - modem identification l n - speaker volume - n=0 speaker volume low n=1 speaker volume low n=2 speaker volume medium * n=3 speaker volume high. m n - speaker activity - n=0 speaker off n=1 speaker on until carrier received* n=2 speaker remains on n=3 speaker on after dialing until dcd detected. nn - modulation selection n=0 communication rate set by at*i command n=1 automatic negotiation of data rate beginning at at*i setting. * on - on line n=0 return on line with no retrain* n=1 initiate retrain while returning on line. n=2 initiate rate renegotiation while returning on line. qn - responses n=0 send responses * n=1 no responses sr? - interrogate register - sr=n - set register value - vn - result codes - n=0 numeric result codes n=1 english word result codes* wn - connect result code - n=0 display connect dce speed n=1 display connect dte speed n=2 display connect dce speed plus error control extension * n=3 display connect dte speed plus error control extension xn - result code set - n=0 responses 0-4 n=1 responses 0-5 & 10 n=2 responses 0-6 & 10 n=3 responses 0-5, 7 & 10 n=4 responses 0-7 & 10* zn - reset - n=0 reset and recall profile 0 * n=1 reset and recall profile 1 &cn - dcd operation n=0 dcd is forced active n=1 dcd indicates a valid carrier signal * &dn - dtr n=0 dtr is ignored n=1 when the modem is on-line dtr off switches it to the command mode and issues ok response. n=2 modem disconnects if the host revokes dtr.* n=3 the modem performs a soft reset when dtr is revoked. &f - reset factory defaults &gn - guard timer - n=0 none * n=1 550 hz guard timer n=2 1800 hz guard timer
xecom (11) xe5620 xe5620 at commands &kn - flow control n=0 no flow control n=3 rts/cts flow control * n=4 xon/xoff flow control n=5 transparent xon/xoff flow control &pn - pu lse dial make/break ratio n=0 39%/61% 10 pps * n=1 33%/67% 10 pps n=2 39%/61% 20 pps n=3 33%/67% 20 pps &sn - data set read y n=0 data set ready forced active * n=1 data set ready on at start of modem handshake &un - protocol selection n=0 v.90 * n=1 v.34bis/v.34 n=2 v.32bis/v.22bis n=3 bell 103 n=4 v.21 n=5 v.23 &v - view active configuration &wn - store current configuration n=0 store active configuration in profile 0 * n=1 store active configuration in profile 1 &yn - select configuration to recall n=0 recall configuration profile 0 * n=1 recall configuration profile 1 &zn=x - store dialing string x %cn - data compression control n=0 no data compression n=1 data compression enabled * \nn - error control mode n=0 normal mode n=1 direct mode n=2 mnp required n=3 mnp or normal n=4 auto error correction v.42 without odp or adp phase detection, mnp or normal mode n=5 auto reliable mode * n=6 v.42 without odp or adp phase detection required n=7 v.42 with odp or adp phase detection required \vn - protocol result code n=0 no protocol result code added to response * n=1 protocol result code added to response *hn - automatic retrain n=0 automatic retrain disabled n=1 automatically retrain on poor signal quality *in - select maximum connection speed n=0 1200 bps, n=1 2400 bps, 28,000 with at&u=0 n=2 4800 bps, 29,333 with at&u=0 n=3 7200 bps, 30,666 with at&u=0 n=4 9600 bps, 32,000 with at&u=0 n=5 12,000 bps, 33,333 with at&u=0 n=6 14,400 bps, 34,666 with at&u=0 n=7 16,800 bps, 36,000 with at&u=0 n=8 19,200 bps, 37,333 with at&u=0 n=9 21,600 bps, 38,666 with at&u=0 n=10 24,000 bps, 40,000 with at&u=0 n=11 26,400 bps, 41,333 with at&u=0 n=12 28,800 bps, 42,666 with at&u=0 n=13 31,200 bps, 44,000 with at&u=0 n=14 33,600 bps *, 45,333 with at&u=0 n=15 46,666 bps with at&u=0 n=16 48,000 bps with at&u=0 n=17 49,333 bps with at&u=0 n=18 50,666 bps with at&u=0 n=19 52,000 bps with at&u=0 n=20 53,333 bps with at&u=0 n=21 54,666 bps with at&u=0 n=22 56,000 bps with at&u=0 * *hn - automatic retrain n=0 automatic retrain disabled n=1 automatically retrain on poor signal quality *
xecom (12) xe5620 xe5620 at class 1 fax commands at+fclass? - service class indication 0 = configured as a data modem 1 = configured for service class 1. at+fclass=? - service class capability 0 = configured as a data modem 1 = configured for service class 1. at+fclass=n - set service class 0 = configured as a data modem 1 = configured for service class 1. at+fae=n - data/fax auto answer 0 = answer as a fax modem only 1 = either a fax or data modem at+flo - flow control 0 = flow control off 1 = xon/xoff flow control selected 2 = rts/cts flow control selected at+frh - receive hdlc data 3 v.21 channel 2, 300 bps 24 v.27ter, 2400 bps 48 v.27ter, 4800 bps 72 v.29, 7200 bps 96 v.29, 9600 bps 97 v.17, 9600 bps 98 v.17 short train, 9600 bps 121 v.17, 12,000 bps 122 v.17 short train, 12,000 bps 145 v.17, 14,400 bps 146 v.17 short train, 14,400 bps at+frm - receive fax (see at+frh for "mod" values) at+frs - receive silence at+frtn - receive test data at+fth - transmit hdlc data (see at+frh for "mod" values) at+ftm - transmit fax (see at+frh for "mod" values) at+fts - transmit silence at+fttn - transmit test data
xecom (13) xe5620 xe5620 modem registers s0 answer on nth ring: s0 sets the modem to automatically answer on the nth ring. setting s0 to 0 disables automatic answer. range: 0 to 255 units rings default 0 s1 ring count: s1 is a read-only register showing the number of rings detected. if a ring is not detected within 8 seconds, s1 is reset to zero. range: 0 to 255 units rings default 0 s2 escape character: s2 determines the ascii escape character. values of 0-127 select valid characters; values from 128 to 255 disable the escape sequence. range: 0 to 255 units ascii character default 43 (+) s3 line termination character: s3 determines the ascii character which will terminate commands and modem responses. range: 0 to 127 units ascii character default 13 (carriage return) s4 line feed character: s4 sets the ascii character to act as a line feed character in modem responses. range: 0 to 127 units ascii character default 10 (line feed) s5 backspace character: s5 defines the ascii character used as a backspace to edit the command line. range: 0 to 127 units ascii character default 8 (back space) s6 dial tone wait time: s6 determines how long the modem waits for dial tone before dialing. the dial tone wait time cannot be set to less than two seconds. range: 3 to 7 units seconds default 6 s7 wait for carrier after dialing: s7 determines how long the modem waits for a valid carrier signal after dialing. range: 1 to 255 units seconds default 60 s8 comma pause time: s8 defines the duration of the pause initiated by a comma in the dialing string. the pause is generally used when waiting for a second dial tone. range: 1 to 255 units seconds default 2 s9 carrier detect response time: s9 establishes the length of time the remote modem's carrier must be present to be recognized as valid. range: 1 to 255 units 0.1 seconds default 6 s10 carrier off disconnect delay : s10 selects how long carrier must be lost before the modem disconnects. note: if s10 is smaller than the value of s9 or s10 is set to 255, the modem will not automatically disconnect on loss of carrier. range: 1 to 255 units 0.1 seconds default 14 s11 tone dialing speed: s11 sets the duration and spacing of the dialing tones. s11 does not affect the pulse dialing. range: 50 to 255 units 1 millisecond default 95 s12 escape code guard timer: s12 sets the escape sequence guard timer. if characters are received before or after the escape sequence, within the guard timer, the modem aborts the escape attempt and remains in data mode. range: 0 to 255 units 0.02 seconds default 50 s13 pulse dialing : s13 permits pulse dialing to be disabled register setting function 0 no pulse dialing 1 pulse dialing allowed
xecom (14) xe5620 xe5620 modem registers (continued) s14 bit-mapped register: s14 stores the values of several at commands. bit function 0 echo (ate0) 1 reserved 2 result codes (atq0) 3 numeric responses (atv0) 4,5 pulse dialing parameters (at&p0) s21 bit-mapped register: s21 stores the values of several at commands. bit function 0-2 reserved 3,4 dtr condition (at&d) 5 dcd function (at&c) 6 dsr function (at&s) 7 reserved s22 bit-mapped register: s22 stores the values of several at commands. bit function 0-3 speaker control (atl/atm) 4,5,6 response set (atx) 7 reserved s23 bit-mapped register: s23 stores the modem?s active data format. bit function 0, 1,2,3 dte rate 0-300 bps 4,5 parity 6,7 reserved s30 inactivity timer: s30 determines how long the mo- dem wil remain on line with not data flowing. a 0 in this register disables the inactivity time out. range: 0-255 units minutes default 0 s45 sleep mode timer: s45 determines how long the mo- dem wil remain inactive before entering the low power sleep mode. range: 0, 5-255 units seconds default 0 s95 bit-mapped register: s95 stores the modem?s result code and moduleation information. bit function 0, 1, 2 result code selection 3 modulation selection 4-7 reserved s97 bit-mapped register: s97 stores the modem?s error control and data compression information. bit function 0-2 error correction selection 3-6 reserved 7 data compression selection s98 bit-mapped register: s98 stores the automatic retrain and flow control status. bit function 0, 1 error correction selection 2, 3 reserved 4-6 flow control selection 7 reserved
xecom (15) xe5620 xe5620 modem responses digits verbose description 0 ok command successful 1 connect 300 bps connection 2 ring ring signal detected 3 no carrier carrier not detected 4 erro r error in command line 5 connect 1200 1200bps connection 6 no dial tone no dial tone detected 7 busy busy signal detected 8 n o answer no 5 sec. silence detected 9 connect 300 300 bps connection 10 connect 2400 2400 bps connection 11 connect 4800 4800 bps connection 12 connect 9600 9600 bps connection 13 connect 7200 7200 bps connection 14 connect 12000 12,000 bps connection 15 connect 16800 16,800 bps connection 16 connect 19200 19,200 bps connection 17 connect 21600 21,600 bps connection 20 connect 14400 14,400 bps connection 21 connect 24000 24,000 bps connection 22 connect 38400 38,400 bps connection 23 connect 57600 57,600 bps connection 24 connect 1 15200 115,200 bps connection 25 connect1200tx/75rx v.23 connection 1200 bps transmit 75 bps receive 26 connect75tx/1200rx v.23 connection 75 bps transmit 1200bps receive 28 connect bell 300 bell 300 bps connection 29 connect v21 v21 300 bps connection digits verbose description 30 connect 26400 26,400 bps connection 31 connect 28800 28,800 bps connection 32 connect 31200 31,200 bps connection 33 connect 33600 33,600 bps connection 34 connect 28000 v.90 28,000 bps connection 35 connect 29333 v.90 29,333 bps connection 36 connect 30666 v.90 30,666 bps connection 37 connect 32000 v.90 32,000 bps connection 38 connect 33333 v.90 33,333 bps connection 39 connect 34666 v.90 34,666 bps connection 40 connect 36000 v.90 36,000 bps connection 41 connect 37333 v.90 37,333 bps connection 42 connect 38666 v.90 38,666 bps connection 43 connect 40000 v.90 40,000 bps connection 44 connect 41333 v.90 41,333 bps connection 45 connect 42666 v.90 42,666 bps connection 46 connect 44000 v.90 44,000 bps connection 47 connect 45333 v.90 45,333 bps connection 48 connect 46666 v.90 46,666 bps connection 49 connect 48000 v.90 48,000 bps connection 50 connect 49333 v.90 49,333 bps connection 51 connect 50666 v.90 50,666 bps connection 52 connect 52000 v.90 52,000 bps connection 53 connect 53333 v.90 53,333 bps connection 54 connect 54666 v.90 54,666 bps connection 55 connect 56000 v.90 56,000 bps connection
xecom (16) xe5620 fcc instructions the xe5620 complies with part 68 of the fcc rules and regulations. with each device shipped, there is a label which contains, among other information, the fcc registration number and ringer equivalence number (ren) for this product. you must, upon request, provide this information to your telephone company. the mounting of this device in the final assembly must be made in such a manner as to preserve the high voltage protection be- tween the tip/ring connection and the rest of the system. typically, this may be accomplished by maintaining a minimum spacing 100 mils between the tip/ring traces to the rj-11c jack and low voltage portion of the system. no additional cir- cuitry may be attached between tip/ring and the telephone line connection, unless specifically allowed in the rules. the ren is useful to determine the quantity of devices you may connect to a telephone line and still have all of these devices ring when the number is called. in most, but not all areas, the sum of the rens of all devices connected to one line should not exceed five (5.0). to be certain of the number of devices you may connect to the line, as determined by the ren, you should contact the local telephone company to determine the maximum ren for you calling area. if your system causes harm to the telephone network, the telephone company may discontinue service temporarily. if possible, they will notify you in advance. if advance notification is not practical, you will be notified as soon as possible. your telephone company may make changes in its facilities, equipment, operations or procedures that could affect proper func- tioning of your equipment. if they do, you will be notified in advance to give you an opportunity to maintain uninterrupted tele- phone service. if you experience trouble with this device, please contact xecom at (408) 945-6640 for information on obtaining service or repairs. the telephone company may ask you to disconnect this device from the network until the problem has been corrected or until you are sure that the device is not malfunctioning. the device may not be used on coin service lines provided by the telephone company (this does not apply to private coin tele- phone applications which use standard telephone lines). connection to party lines is subject to state tariffs.
xecom (17) xe5620 devices sold by xecom are covered by the warranty provisions appearing in its terms of sale only. xecom makes no war- ranty, 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 en- vironmental 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 cir- cuits, patents, or licenses are implied. 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) sup- port 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 ex- pected to cause failure of the life support device or system, or to affect its safety or effectiveness. terms of sale life support policy copyright, xecom ? 2002 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. xecom incorporated 374 turquoise street, milpitas, ca 95035 ph:408-945-6640 fax:408-942-1346 e-mail: info@xecom.com

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