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| xecom (1) XE1414c XE1414c 5/2002 worldwide 14.4 kbps modem module for embedded applications description xecom's XE1414c is a complete, 14.4 kbps modem in a single component. xecom designed the XE1414c for use throughout north america, europe and japan. it includes user transferrable fcc part 68 registration for direct connection to telephone lines in the united states and is compliant with ctr21. the XE1414c is a complete modem packaged in a compact module. the XE1414c includes all required modem circuits including the daa. XE1414c users do not need to add ram, rom, crystals, low distortion transformer, or switches to complete the modem design. the user only needs to provide the ttl level, serial interface and the telephone line connection. the XE1414c is pin compatible with xecom's xe3314c modem. this family of modems permits a simple upgrade path from 14,400 bps to 33,600 bps for international embedded modem applications. features ? meets telecom requirements for europe, north america, and japan: includes user transferrable fcc part 68 registration and ctr21 compliance ? small size: 2.75 inches by 1.38 inches by 0.42 inches; ? modem protocols support data transfer from 300 bps to 14.4 kbps: v.32bis, v.32, v.22bis, v.22, v.21, bell 212a and 103; ? modem control and configuration via at commands ? fax protocols: v.17, v.29, v.27ter, and v.21 channel 2 ? error correction; v.42, mnp2-4 and mnp10 ? data compression; v.42bis and mnp5 provides a maximum effective data rate of 57,600 bps. ? non-volatile memory included for storing telephone numbers and modem configuration. ? standard operating temperature range 0c to 70c. extended range of -40c to +85c is available. ? supports leased line applications. block diagram modem controller rom nvram analog front end daa /dtr /rts /cts /dsr txd rxd /dcd serial i/o reset ar lcs oh amp l1 l2 tip ring auxiliary i/o
xecom (2) XE1414c XE1414c pin configuration nc ar rxd nc nc nc nc nc /dtr lcs /cts nc txd /rts nc /ri tip ring vcc /dsr /dcd nc reset nc nc nc nc nc oh nc l2 l1 amp gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 22 21 XE1414c mechanical specifications pins = 0.025 inch square pin; all pins tin-plated a 2.74 2.760 69.60 70.10 b 1.370 1.390 34.80 35.31 c 0.420 0.430 10.67 10.92 d 1.190 1.210 30.23 30.73 e 1.890 1.910 48.01 48.51 f 0.125 0.200 3.18 5.08 g 0.080 0.100 2.03 2.54 h 0.415 0.435 10.54 1 1.05 j 0.090 0.110 2.29 2.79 k 0.020 0.025 0.51 0.64 inches metric(mm) pin min max min max denotes pin 1 a b k f h e j h c d g g xecom (3) XE1414c pin name descr iption XE1414c pin descriptions 1 nc no internal connection 2 ar auxiliary data/voice relay, active high output, ttl/cmos. the ar signal goes high when ever the mo- dem is in the on-hook state. it can be connected to an external relay to switch control of the telephone line between the modem and an auxiliary handset when. 3 rxd received data, output, ttl. serial data output to the host. a logic "high" on rxd represents a "mark" and a logic "low" represents a "space". 4-8 nc no internal connection 9 \dtr data terminal ready, input, active low, ttl. the "at&d" command sets the function of \dtr. the de- fault, at&d2, requires the host to assert \dtr to permit a modem link. the modem drops the call in progress if \dtr is revoked and will not connect until \dtr is reasserted. 10 lcs loop current sense, input, active high, ttl/cmos. lcs provides an input to the modem from an ex- ternal loop current sensor. the loop current sensor may be required for some applications in which the modem shares a telephone line with a telephone handset. 11 \cts clear to send, output, active low, ttl/cmos. \cts provides the flow control output from the modem when hardware flow control is selected. the modem revokes \cts when the modem's input buffer is full. the modem reasserts \cts when the buffer can accept more data without a buffer overflow. 12 nc no internal connection 13 txd transmit data, input, ttl. serial data input from the host. a logic "high" represents a "mark" and a low represents a "space", ttl. 14 \rts request to send, input, active low, ttl. the XE1414c uses \rts for hardware flow control. when \rts is revoked; hardware flow control is activated, and the modem will not place data on rxd. 15 nc no internal connection 16 \ri ring indicator, output, active low, ttl. when low indicates the modem is receiving a ring signal. 18 tip tip connection to the phone line (rj11 pin 3) from the internal daa. the XE1414c is not sensitive to the battery voltage polarity across tip and ring. 20 ring ring connection to the phone line (rj11 pin 4) from the internal daa. 21 gnd ground (0 volts) 22 amp audio output function is set by l & m commands and the value in register s22. this output can drive a minimum load of 300 ohms. 27-28 l1, l2 l1 and l2 provide the control the performance of the loop current holding circuit. when a jumper is applied between l1 and l2, the ctr21 current limiting circuit is active and dc loop current is limited to 60 milliamps. when no jumper is provided, a full 100 milliamps of loop current is supported. 29 n/c no internal connection 30 oh off-hook, output, active high. oh indicates the modem's hookswitch relay is closed. hookswitch closure connects the modem to the telephone line. 31-35 n/c no internal connection 36 reset hardware reset pin, input, active high, ttl. a high on pin 36 initiates a hardware reset. an external reset is not required or recommended. the reset pulse must be held a minimum of 100 milliseconds. 37 n/c no internal connection xecom (4) XE1414c parameter min typ max u nits comments XE1414c electrical specifications vcc 4.75 5.25 volts icc 140 160 180 ma on line 40 ma sleep mode ring voltage detected 38 150 rms type b ringer ring frequency detected 15.3 68 hz type b ringer telephone loop current 20 100 ma off-hook data transmit level -11.0 -10.0 -9.0 dbm dtmf transmit level -2.5 0 dbm avg over 3 second interval supply voltage - vcc +6.5 volts dc input voltage -0.6 volts to +6.5 volts storage temperature range -25 c to +85 c lead temperature (soldering, 2 sec per wave) 260 c operating temperature range 1 0 to 70 c *exceeding these values may result in permanent damage to the device. 1 extended operating temperature (-40 to +85 c) available. order XE1414c-itr XE1414c absolute maximum ratings pin name descr iption XE1414c pin descriptions 38 \dcd data carrier detect, output active low, ttl/cmos. the &c command sets the function of \dcd. in the default state \dcd activates when a valid carrier is detected. 39 \dsr data set ready, output, active low, ttl/cmos. &s sets the \dsr function. in the default condition, at&s0, \dsr is forced true. 40 vcc +5 volts xecom (5) XE1414c XE1414c typical connection diagram notes: 1) rj11 pin assignments reflect a 6-pin connector. tip and ring are always the center pins of the rj11 jack. 2) ctr21 requires the modem to be able to dissapate over two watts in come applications where the integral current limiting circuit is activated. the XE1414c requires a heat sink to be added to dissapte this addi- tional power. recommended parts refer ence designation description recommended part number fb1, fb2 ferrite beads tdk acb2012l-120-x c1, c2 capacitors panasonic eckdrs471, 470 pfd, 2600 volts j1 rj11 jack stewart ss6446nf XE1414c /rxd /txd /dtr /rts /cts /dsr /dcd /ri 16c550 uart lm386 .05 ufd 10 ohms 250 ufd 8 ohm, .5 w speaker .2 ufd 50k amp gnd ring tip l1 l2 fb1 fb2 c1 c2 j1 xecom (6) XE1414c country selection xecom has designed the XE1414c to the telephone standards of a wide variety of countries throughoput the world. below is a list of the country standards which xecom has found the XE1414c to comply. please contact xecom if you have questions regarding a country not on this list. countries supported: countr y a t command austria a t+gci=0a belgium at+gci=0f denmark at+gci=31 finland at+gci=3c france a t+gci=3d germany at+gci=42 greece a t+gci=46 holland a t+gci=7b ireland at+gci=57 italy at+gci=59 japan at+gci=00 korea a t+gci=b5 norway at+gci=82 portugal at+gci=8b singapore at+gci=b5 spain a t+gci=a0 sweden a t+gci=a5 switzerland a t+gci=a6 taiwan a t+gci=b5 united kingdom at+gci=b4 united states at+gci=b5 note: country regulations permit xecom to offer transferrable registration only in the united states, fcc part 68 only. all other required certifications of systems using the XE1414c are the responsibility of xecoms customer. xecom will assist our customers with any of these certifications. xecom (7) XE1414c application note: XE1414c leased line operation the XE1414c can support leased line applications. because newer chipsets do not support automatic leased line operation, the leased line handshake must be controlled by the local host. before attempting to establish the leased line connection, one modem must be defined as the originating modem and one as the answering modem. the local host issues an atd to initiate handshaking on the originating modem and ata to intiate the handshake on the answering modem. if the leased line connection is broken both local hosts must act to re- initiate the handshake sequence. no special configuration is required for leased line operation. any modem configuration for error correction, data compression, and flow control will work. decribed below are some configuration options which may be beneficial in your leased line application. at&c1 this command sets the operation of the data carrier detect signal. with the &c1 setting data carrier detect becomes active whenever the modem detects a valid carrier signal and becomes inactive when that carrier signal is lost. the local host can monitor data carrier detect to determine whether or not the leased line connection is intact. at+ms this command controls the modem handshaking options. it can be used to limit the modem handshake to a particular speed or protocol. the +ms command includes four selectable parameters; modulation, automatic fallback during negotiations, minimum accepted data rate and maximum data rate. setting the maximum and minimum data rates to the same value will require the modem to connect at only the desired data rate. the format and codes for the +ms command are shown below. at+ms modulation, auto negotiation, minimum data rate, maximum data rate xecom (8) XE1414c modes of operation the XE1414c uses "at" commands for modem control and configuration. the XE1414c operates in three modes; command mode, fax mode and data mode. extensions to the at command set support fax operation. data mode: the modem enters data mode after establishing a modem link and issues a "connect" result code. in data mode the modem modulates all signals presented on transmit data, pin 13, and sends them to the remote modem. the modem demodulates the signal from the remote modem and places it onto received data, pin 3, for the host equipment. when the modem exits data mode, it issues a "no carrier" result code. command mode: the XE1414c enters command mode on application of power, reset, loss of the connection, or receipt of the escape sequence. in command mode the modem accepts commands from the host on transmit data. appropriate result codes are returned on received data at the same speed and parity as the commands. fax mode: the modem enters fax mode on receipt of the at+fclass=1 command. fax commands and responses are issued at 19,200 bits per second; the character format is 8 bits no parity. the modem accepts class 1 fax commands only in fax mode. the a/, ato, at&t and escape commands are not valid in fax mode. commands the modem is configured and controlled with at commands. at commands follow a strict format. the command line is stored in the command buffer and executed upon receipt of a carriage return. until executed, the command line can be edited with the backspace key. command format - each command, except a/, 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 modem uses the prefix to identify the host's speed and parity. the modem determines speed by measuring the width of the incoming bits and parity by comparing the parity bits of the "a" and "t." the modem then returns result codes at the host's speed and parity. command line - a command line may include multiple commands. the modem executes the commands in the sequence they appear in the command line. spaces, inserted to improve legibility, do not fill space in the command buffer. a carriage return terminates 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 40 characters, including the at prefix. if it overflows, the modem issues an "error" result code and commands are not executed. command line editing - a backspace can be used to edit the command line any time before it is executed. the backspace character erases the previous character in the command line. any character except for the "a" and "t" can be erased. register s5 allows the user to select a character other than a backspace to edit the command line. re-execute last command - the a/ command causes the XE1414c to re-execute the command line stored in the command buffer. this is the only command which does not require the "at" prefix. omitted parameters - most commands include a parameter which determines the command function. when the parameter is omitted from the command string, it is assumed to be a 0. escape characters - a three character escape sequence, entered while in data mode, will switch the modem into command mode while remaining on line. the escape character, set by register s2, is entered 3 times in succession to execute the escape. the default escape sequence is "+++." result codes - the modem issues a result code after each action. result codes may be provided as full words, numeric codes or may be disabled. 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. XE1414c at commands xecom (9) XE1414c XE1414c at commands (continued) list of commands an asterisk indicates the default setting of the command for the XE1414c. a - answer command - ata forces the modem to immedi- ately go off-hook and begin transmitting the answer tone se- quence. bn - select communications standard - atbn selects the modulation scheme used for connections below 2400 bits per second n=0 selects ccitt standards * n=1 selects bell standards d - dial command - below are the characters accepted in a dialing command. 0-9, #, * = dialing digits l = re-dial last number p = pulse dial t = tone dial s=n = dial stored number w = wait for dial tone ^ = toggles state of calling tone , = pause for the duration of s8 @ = wait for silence ! = switch hook flash ; = return to the command state en - command echo - aten determines whether commands will be echoed back to the host. n=0 do not echo commands n=1 enable command echo* hn - switch hook control - athn opens and closes the modem's hook switch. n=0 switch hook relay opens n=1 the switch hook relay closes in - modem identification - atin identifies the version of the modem. ln - speaker volume - atln sets the amplitude of the modem's audio output. n=0 lowest speaker volume n=1 low speaker volume* n=2 moderate speaker volume n=3 high speaker volume mn - speaker activity - atmn determines when the modem's audio output is active. n=0 speaker off n=1 speaker on until carrier received* n=2 speaker remains on n=3 speaker off during dialing, on until carrier on - on line - aton switches the modem from the com- mand mode to the data mode. n=0 return on line with no retrain* n=1 initiate retrain returning on line. qn - responses - atqn determines if the modem will issue responses. n=0 send responses* n=1 no responses sr? - interrogate register - atsr? requests the current value in register sr. sr=n - set register value - atsr=n sets the value of register sr to n. vn - result codes - atvn sets the modem to issue numeric or full word result codes . n=0 numeric result codes n=1 english word result codes* wn - connect message rate - atwn determines whether the data rate reported in the connect response is the host data rate, the link data rate or whether both are provide along with the error control and data compression protocols negotiated. n=0 respond "connect xxxx" where xxxx is the dte rate* n=1 report line speed, dte speed and link protocol n=2 respond "connect xxxx " where xxxx reports link speed xn - result code set - atxn selects which set of result codes the modem may send. n=0 result codes 0 to 4 n=1 result codes 0 to 5 and 10 n=2 result codes 0 to 6 and 10 n=3 result codes 0 to 5, 7 and 10 n=4 full result codes* xecom (10) XE1414c XE1414c at commands (continued) zn - reset - atzn executes a soft reset to the modem and resets the modem configuration. n=0 reset to user profile 0* n=1 reset to user profile 1 &cn - dcd operation - at&cn determines the operation of the dcd output. n=0 dcd is forced active. n=1 dcd indicates a valid carrier* &dn - dtr - at&dn determines how the modem will respond to changes to dtr. n=0 dtr is ignored by the modem. n=1 enter command mode if dtr revoked. n=2 disconnect if dtr revoked.* n=3 soft reset when dtr revoked &fn - return to factory defaults - at&fn returns the modem configuration to one of two factory configurations. n=0 restore configuration 0 n=1 restore configuration 1 &gn - guard tone - at&gn controls the guard tone produced by the modem n=0 guard tone disabled * n=1 guard tone disabled n=2 1800 hz guard tone &kn - flow control - at&kn selects the flow control method used by the modem. n=0 disabled n=3 rts/cts * n=4 xon/xoff n=5 transparent xon/xoff &pn - dial pulse make/break ratio - at&pn determines the specific pulse dialing parameters used by the modem. n=0 39/61% @ 10 pps* n=1 33/67% @ 10 pps n=2 39/61% @ 20 pps n=3 33/67% @ 20 pps &qn - line connection - at&qn determines if error control or data buffering are active on the link. n=0 direct mode (no data buffering) n=5 use error correction * n=6 normal mode (speed buffering) &sn - dsr operation - at&sn sets the operation of the dsr signal. n=0 dsr always active* n=1 dsr in accordance with v.25. &tn - test modes - at&t selects modem test modes. n=0 exit test mode n=1 local analog loopback &vn - view configuration profiles - at&v permits the user to check on the modems current configuration. n=0 view current active and user profiles * n=1 view statistics from last connection &wn - store active profile - at&wn stores the current modem configuration in nvram. n=0 store active profile as profile 0 n=1 store active profile as profile 1 &yn - recall stored profile - at&yn sets the stored modem configuration to be used after a hard reset. n=0 recall profile 0 on power-up* n=1 recall profile 1 on power-up &zn=x - store phone number "x" in memory location "n" %cn - data compression - this command sets the modems data compression negotiations. n=0 no data compression n=1 enables mnp5 data compression n=2 enables v.42bis data compression n=3 enables both mnp5 and v.42bis * %en - line quality monitor/auto retrain - at%en determines if the modem will monitor line quality during a connection and initiate a retrain if quality drops below acceptable levels. n=0 disabled n=1 enabled n=2 line quality, fallback, fall forward * %l - read received signal level - at%l permits the user to read the magnitude of the receive signal in dbm. %q - read line signal quality - at%q permits the user to read the eqm value of the received signal. xecom (11) XE1414c XE1414c at commands (continued) \bn - transmit break - at\bn selects the duration of the break signal sent. break = n x 100 msec. \kn - break control - at\kn determines how the modem will handle a break signal received from the host. break received from host in data transfer mode. n=0 enter on-line command mode; do not transmit break n=1 purge buffers, immediately transmit break n=2 same as n=0 n=3 immediately send break n=4 same as n=0 n=5 send break in sequence with data * break received from the host during the on-line com- mand mode. n=0 purge buffers, immediately transmit break n=1 same as n=0 n=2 immediately send break n=3 same as n=2 n=4 send break in sequence with data n=5 same as n=4 * break received from modem during a non-error cor- rected link n=0 purge buffers, immediately send break to host n=1 same as n=0 n=2 immediately send break to the host n=3 same as n=2 n=4 send break in sequence with data. n=5 same as n=2* \nn - error control selection - at\nn determines how the modem will handle error control negotiations. n=0 normal mode, no error correction n=1 direct mode, no buffering, no error correction n=2 reliable mode, error correction required n=3 v.42 auto-reliable mode, accept either an error controlled or non-error controlled link* n=4 v.42 reliable mode, lapm required n=5 mnp required /v xecom (12) XE1414c XE1414c modem registers s0 answer on nth ring: s0 sets the modem to auto- matically 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 sets the ascii escape character. values of 0-127 select valid ascii escape characters; values from 128 to 255 disable the escape sequence. range: 0 to 255 units ascii character default 43 (+) s3 carriage return character: s3 determines the ascii character to serve as a carriage return to 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 back space character: s5 defines the ascii character used as a backspace to edit the command line. range: 0 to 32 units ascii character default 8 (back space) s6 dial tone wait time: s6 determines how long the modem waits for dial tone before dialing begins. the dial tone wait time cannot be set to less than two seconds. range: 2 to 255 units seconds default 2 s7 wait for carrier after dialing: s7 determines how long the modem waits for a valid carrier signal after dialing is completed. range: 1 to 255 units seconds default 50 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 reserved: s10 carrier off disconnect delay : s10 selects how long carrier must be lost before the modem disconnects. note: if the value of s10 is smaller than the value of s9, 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 rate. 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 xecom (13) XE1414c XE1414c modem registers (continued) s14 general bit-mapped options: s14 reflects the state of several "at" commands. bit 0,4,6 not used bit 1 0 = echo disabled (ate0) 1 = echo active (ate1) bit 2 0 = send result codes (atq0) 1 = no result codes (atq1) bit 3 0 = numeric result codes (atv0) 1 = full word result codes (atv1) bit 5 0 = tone dialing selected (t) 1 = pulse dialing selected (p) bit 7 0 = answer 1 = originate s16 test status: s16 shows the modem test status. bit 0 0 = no local analog loopback 1 = local alb active bit 1-7 not used s21 general bit-mapped options: s21 reflects the state of several "at" commands. bit 0-1 not used bit 2 always on bit 3,4 0 = dtr ignored (&d0) 1 = enter command mode on dtr off (&d1) 2 = disconnect on dtr off (&d2) 3 = reset on dtr off (&d3) bit 5 0 = dcd always active (&c0) 1 = dcd on with carrier (&c1) bit 6 0 = dsr always active (&c0) 1= dsr on when modem ready (&c1) bit 7 not used s22 general bit-mapped options: s22 reflects the state of several "at" commands. bit 0-1 0 = low speaker volume (atl0) 1 = low speaker volume (atl1) 2 = moderate speaker volume (atl2) 3 = high speaker volume (atl3) bit 2-3 0 = speaker off (atm0) 1 = speaker off with carrier (atm1) 2 = speaker always on (atm2) 3 = speaker on during handshake (atm3) bit 4-6 0 = basic result codes (atx0) 4 = connect speed result codes (atx1) 5 = no blind dial (atx2) 6 = busy detection (atx3) 7 = full result codes (atx4) bit 7 not used s23 general bit-mapped options: s23 reflects the state of several "at" commands. bit 0-5 not used bit 6-7 0 = no guard tone (at&g0) 1 = no guard tone (at&g1) 2 = 1800 hz guard tone (at&g2) 3 = not used s24 sleep mode timer: s24 sets the length of time in seconds that the modem must be idle befor entering the low power, sleep mode. when set to 0, sleep mode is disabled. range: 0 to 255 units seconds default 0 s27 general bit-mapped options: s27 reflects the state of several "at" commands. bit 0 1 3 0 0 0 = normal mode (at&q0) 101 = error control enabled (at&q5) 011 = direct mode (at&q6) bit 2, 4-5, 7 not used bit 6 0 = ccitt protocols (atb0) 1 = bell protocols (atb1) s28 pulse dialing bit-mapped options: s28 stores the modem's pulse dialing configuration. bit 0-2, 5-7 not used bit 3-4 0 = make/break ratio 39%/61%; 10 pulses per second (at&p0) 1 = make/break ratio 33%/67%; 10 pulses per second (at&p1) 2 = make/break ratio 39%/61%; 20 pulses per second (at&p2) 3 = make/break ratio 33%/67%; 20 pulses per second (at&p3) s29 hook flash timer: s29 determines the length for time the modem closes its off-hook relay on receipt of the "!" dial modifier to simulate a switch hook flash. range: 0 to 255 units 10 milliseconds default 70 xecom (14) XE1414c XE1414c modem registers (continued) s30 disconnect on inactivity timer: s30 sets the periond the modem is idle before it disconnects. a 0 disables the inactivity timer. range: 0 to 255 units 10 seconds default 0 s31 general bit-mapped options: s31 stores the status of various at commands. bit 0 0 = no single-line connect messages (at\v0) 1 = use single-line connect messages (at\v1) bit 1 not used bit 2-3 0 = report host speed (atw0) 1 = report all parameters (atw1) 2 = report modem speed only (atw2) bit 4-7 not used s36 lapm failure: s36 instructs the modem what to do if the error control negotiations fail. bit 0-2 0 = modem disconnects 1 = establish direct connection 2 = reserved 3 = establish normal connection 4 = disconnect if mnp handshake fails 5 = establish direct connection if mnp handshake fails. 6 = reserved 7 = establish normal connection if mnp handshake fails. bit 3-7 not used s38 forced disconnect timer: s38 sets the delay between receipt of the command to disconnect and the actual opening of the switch hook. if s38 is set to 255 the modem disconnects only after its buffers are empty. range: 0 to 255 units 1 second default 20 s39 flow control bit-mapped options: s39 shows the modem's flow control status, at&k. bit 0-2 0 = flow control disabled 1 = reserved 2 = reserved 3 = hardware flow control, rts/cts 4 = in-band flow control xon/xoff 5 = transparent in-band flow control 6 = reserved 7 = reserved bit 3-7 not used s40 mnp bit-mapped options: s40 shows the status of the modem's mnp commands, . bit 0-1 0 = no lapm/mnp10 conversion (at-k0) 1 = enable lapm/mnp10 conversion (at-k1) 2 = enable lapm to mnp10 conversion ex cept for lapm answer mode (at-k1) bit 2 not used bit 3-5 0 = at\k0 break handling selected 1 = at\k1 break handling selected 2 = at\k2 break handling selected 3 = at\k3 break handling selected 4 = at\k4 break handling selected 5 = at\k5 break handling selected bit 6-7 not used s41 general bit-mapped options: s41 stores the condi- tion of various "at" commands. bit 0-1 0 = no data compression (at%c0) 1 = mnp5 data compression (at%c1) 2 = v.42bis data compression (at%c2) 3 = either mnp5 or v.42bis (at%c3) bit 2, 6 0 0 = no fallback/forward (at%e0) 1 0 = retrain enabled (at%e1) 0 0 = fallback/forward enabled (at%e2) bit 3-5, 7 not used s46 data compression control: s46 selects whether or not the modem will support data compression. s46=136 no data compression s46=138 data compression selected default 138 s48 v.42 negotiations: s48 determines the modem's v.42 negotiation process. s48=0 proceed with lapm s48=7 negotiate per v.42* s48=128 assume lapm failure xecom (15) XE1414c XE1414c modem registers (continued) s86 call failure code: s86 shows why the last "no car- rier response was issued. s86=0 normal disconnect s86=3 call waiting caused disconnect s86=4 loss of carrier s86=5 error correction negotiation failure s86=6 no response to feature negotiation s86=7 the other modem was synchronous s86=8 no common framing technique s86=9 no common modem protocol s86=10 bad response to feature negotiation s86=12 disconnect initiated by remote modem s86=13 no response after 10 retries s86=14 protocol violation s86=15 dtr deactvated by host s86=16 received gstn cleardown s86=17 inactivity timeout s86=18 data rate not supported s86=19 long space disconnect s86=20 key abort disconnect s86=21 clear previous disconnect cause s86=22 no connection established s86=23 disconnect after 3 retrains s86=24 call waiting tone detected s86=25 extension pickup detected s86=26 remote hang-up detected s95 extended result codes: s95 permits the user to cus- tomize the extended result codes. bit 0 connect result code shows link speed bit 1 add /arq to connect response bit 2 add /vfc to carrier response bit 3 enable protocol response bit 4 not used bit 5 enable compression result code bit 6 not used bit 7 not used 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+ff - enhanced flow control at+frh |
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