CH1787 CH1787ET 1000VAC EIA-232-D ATS24 2N2222 1N914 TL064 LM393 RJ-11C - Datasheet Archive

 

CH1787 Small Functional Modem microelectronics INTRODUCTION The CH1787 is a small full function modem that is FCC Part 68

 

Cermetek CH1787 CH1787 Small Functional Modem microelectronics INTRODUCTION The CH1787 CH1787 is a small full function modem that is FCC Part 68 approved. It has been designed to be used in applications where there is little or no controller intelligence to command the modem. This allows the user to operate the modem via hardware resources only, not requiring AT Command execution for basic operation. For those applications where there is controller intelligence, the CH1787 CH1787 operates like a standard AT Command driver 2400bps, V.22bis asychronous modem. The CH1787 CH1787 is ideal as a remote modem such as found in alarm products and in industrial controllers. Upon some operational event, the modem will dial a prestored telephone number under pin activation to make a modem connection with a host or another site. The modem can also be set to automatically answer incoming calls or manually answer a call, using an answering pin. A call can be ended via a hang-up pin. GENERAL DESCRIPTION OF FUNCTIONAL BLOCKS Figure 1 is a functional block diagram of the CH1787 CH1787. Each block will be described. The CH1787 CH1787 is a highly integrated, full function modem, comprised of a modulator/demodulator, controller, and an FCC Part 68 approved telephone interface, also called a Data Access Arrangement (DAA) and NVRAM. FEATURES Supports Standards CCITT V.22bis, V.22, Bell 212, and Bell 103 FCC Part 68 approved and DOC approvable Does not require a microprocessor to operate Pin activated hang-up Pin activated answer Manual originate and answer pins AT Command structure available 1000 VAC isolation barrier Single 5 volt operation Low power sleep mode Automatic adaptive and fixed compromise equalization Test modes and diagnostics Size: 2.0 x 1.25 x 0.53 NVRAM allows storage of custom configurations and telephone numbers Operating temperature 0o-70oC Extended temperature -40oC to 85oC order CH1787ET CH1787ET Modulation/Demodulation and Control This Functional Block is comprised of a monolithic modem integrated circuit, with built-in facilities to accommodate integrated AT command control and resident interfaces for general communication and routing to the DAA. Controller The controller is a programed microprocessor that provides commands to the modem in response to external pin activation. The following pins are controlled by the microprocessor and are described in detail in Table 1. These pins are operational when the modem is in use at 2400bps only. ANS - Manual Answer Pin Input - Answer modePlaces modem in answer mode ORG - Manual Originate Pin Input - Originate mode places modem in originate mode ORA- Automatic Dial Pin Input - Dials one of two prestored numbers based on TST TST - Steering Pin Input used with ORA to select the user stored number or Cermetek test number HNG- Hang-up Pin Input used to terminate an active modem connected AAR- Automatic Answer Pin - used to place the modem in Auto Answer Mode Figure 1. CH1787 CH1787 Functional Block Diagram See pin description Table 1 for more details. Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 1 DAA The CH1787 CH1787 is designed to meet North American telephone standards as set by FCC Part 68 and DOC. The telephone line interface is designed to meet 1000VAC 1000VAC and 1500 volt peak surge isolation, among other parameters. As such, it will meet U.S. and Canadian requirements and other international requirements that specify that level of isolation. The CH1787 CH1787 comes with FCC Part 68 approval, a label is provided with the registration number and ringer equivalent. This label should be prominently displayed. As with most countries, except the U.S., Canada requires submission of the product containing the CH1787 CH1787 for DOC approval. This can be done by submitting the design to a test house or consultant. Call Cermetek for a consultant list. NVRAM NVRAM can save up to two user-customized modem configurations. The AT&Wn command will store the active modem configuration in one of two NVRAM locations as selected by an n of 0 or 1. The AT&Yn command selects one of the stored modem configurations to be automatically recalled and active upon a reset or power up. The ATZn command immediately recalls and activates a stored configuration. See Tables 2 and 3 for storable S-Registers and Commands. NVRAM can save up to four telephone numbers with up to 36 digits or modifiers in each telephone number. The AT&Zn=s command will store s, the telephone number dial string. The ATDTS=n command will cause the modem to dial one of the four stored telephone numbers. The NVRAM storage location for the four telephone numbers is selected by an n of 0, 1, 2, or 3. Location 1 is used for the ORA stored number and Cermetek number. Supported Features AT Command Set A 40-character command line is supported. The command line starts with AT and may contain standard or enhanced commands. See Cermetek detailed command summarywww.cermetek.com. Serial Host Interface The serial interface is V.24 (EIA-232-D EIA-232-D) compatible interface. See pin description. Speaker Interface The SPK output reflects the receiver analog input and provides a signal that can be used to monitor call progress. The SPK signal can drive a 300 load directly. The SPK signal is usually input to an audio power amplifier and the amplifier drives a speaker coil. Figure 5 shows how to drive an 8 speaker. The speaker can be turned on and off with the ATMn command. The speaker volume can be adjusted by the ATLn command, where n is 0, 1, 2, or 3. Phone Control The CH1787 CH1787 contains a pin called Voice/Data (V/D). This pin toggles high when the modem goes off hook and can be used to activate a relay which can switch a telephone on or off the Tip and Ring Telco lines. This allows the telephone to be disconnected when a data call is in progress, preventing the data from being disturbed by an inadvertent telephone pick-up. See Figure 2. Figure 2. Voice/Data Port Control SLEEP MODE To minimize the modem power consumption, the CH1787 CH1787 includes a power down feature called the Sleep Mode. When activated the CH1787 CH1787 will automatically enter the Sleep Mode after 0 to 255 seconds of inactivity. The time of inactivity is selected by the ATS24 ATS24 command and 5 seconds is the default time. The modem returns to normal operation when a ring signal is received or is upon an input low signal on TXD. ATS24 ATS24 = 255 disables the Sleep Mode and is the default. _ A SLEEP output signal is available to control power to external devices. In Figure 5, a FET controlled by the SLEEP signal turns off the external speaker amplifier when the modem enters the Sleep Mode. In the sleep mode, power is reduced by 50% of normal operating power. Transmission Speed The transmission rate of the host computer must be 300, 1200, or 2400 bps. The modem will connect at the selected speed or will fall back to the speed set by the remote or answering modems serial interface (the DTE transmission speed). That determines the originate speed. The modem can be either originating (calling modem) or answering (remote modem). The following table shows the speeds: Originate Mode Answer Mode 300 1200 2400* 300 300 1200 1200 1200 300 1200 1200 2400 300 1200 2400 *Pin activated operation at 2400bps only. Other speeds may be used with AT Command operation. Speed and Parity Selection Before a call, the modem adjusts to the host speed (2400, 1200, or 300 bps) and parity (odd, even, mark, space, or none) via a hostinitiated training sequence. This also selects the speed of the data for originate calls. The modem automatically adapts to the callers speed on answer calls. The modem matches the hosts parity when it returns status messages to the host. During a data connection, however, the modem passes parity through without interpretation or alteration. Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 2 POWER SUPPLY The modem module is a complex sub-system that may be treated as any other component. Special attention should be paid to the power supply connections. The modem decodes analog signals from the telephone line that are in the millivolt range. Al though the modem is designed to withstand significantly induced power supply noise, there is a limit. Steps must be taken to guarantee that power supply noise on all supply lines, including ground, does not exceed 50 mV peak to peak. Any frequency between 20 kHz and 150 kHz must be less than 50 mV peak. If necessary, use dedicated power and ground planes. Failure to provide such operating conditions could cause the modem to malfunction. ENABLE RXA MECHANICAL RELAY ONLY. A ZERO IMPEDANCE SWITCH MAY REPLACE THE RELAY AND TRANSISTOR CIRCUIT. +5V 4.7K 2N2222 2N2222 1N914 1N914 +15V 1 RING 2 TIP 20K CH1787 CH1787 3 4 + 20K 1 A 7 RXA 8 DTR TL064 TL064 2.2uF nonpolar 0.1uF RXD HNG CON TST SPKR NC NC NC DAG 9 ANS 10 V/D 11 RST 12 RI 13 CTS 0.1uF 82K 0.1uF AAR 34 GND 33 VCC 32 B 499 2 20K 63.4K 14 DSR VOICE OR DTMF SIGNAL 15 DRA 20K 16 TXD 17 DIR A1 54K 31 30 29 28 27 26 25 24 23 HS 22 DCD 21 19 SLEEP The CH1787requires a single +5V ±5% supply. It is recommended that by-pass capacitors be placed on the power supply as close to the modems supply input as practical. It is recommended that a 10 µF Electrolytic capacitor in parallel with a 0.01µF ceramic capacitor be used. 18 IRQ GND 20 6 - 7 5 0.1uF 11 + 28K A2 TL064 TL064 0.1uF WARNING: The CH1787 CH1787 has been FCC Part 68 approved as a data modem. Utilization of the Voice/Tone Port requires further registration. FCC will require that the system, including the CH1787 CH1787 and the handset or DTMF transceiver, adhere to Part 68 rules. MODEM CONTROL The CH1787 CH1787 modem may be controlled by sending serial ASCII command sequences. The commands are sent to the modem serially on TXD. After execution of the command, the modem returns a serial status message on RXD, to indicate the completion status of the command. Initializing the Modem Before commands may be sent to the modem, the modem must be initialized. This consists of two events: 1) after power-up, a hardware reset pulse must be applied to the modem, and 2) the modem must be trained to the hosts speed (2400, 1200, 300bps) and parity (odd, even, mark, space or none). ADJUST A2 FOR THE DESIRED LEVEL OF AXT VOICE TO BE ECHOED TO AXR. DECREASE RECEIVE GAIN SIGNAL. AXR. BY DECREASING VALUE OF A1. Figure 3. Voice/Tone Injection Power-up Reset After applying power to the modem, an internally generated reset pulse is created. The user can also reset the modem externally by applying the high-going reset pulse to RST for at least 10ms after the +5V power supply has stabilized. Delay sending commands to CH1787 CH1787 for 100-200ms. Training the Modem The modem must be trained to match the hosts speed and parity so that it is able to recognize serial asynchronous commands sent to it by the host UART. The host must retrain the modem each time a reset signal is applied on RST or after a RESET serial command. The modem is trained by sending it the following threecharacter sequence. +Vcc +Vcc +Vcc 3 RI FROM 1787 PIN 12 2 10K .1uF Figure 4. CH1787 CH1787 Application Diagram of Test Circuit Cermetek Microelectronics, Inc. 10K + 22K 8 LM393 LM393 4 1 4.7K 5 + 4.7uF + 7 LM393 LM393 6 ISOLATED ENVELOPE RING DETECT Document No. 603-0182 Rev. D (11/98) 3 Table 1. CH1787 CH1787 Pin Descriptions PIN NAME I/O FUNCTION 1 RING I/O Di rectly connects to the telephone li ne's Ri ng lead through a user suppli ed RJ-11C RJ-11C jack. 2 TIP I/O Di rectly connects to the telephone li ne's Ti p lead through a user suppli ed RJ-11C RJ-11C jack. 7 RXA O ANALOG VOICE INJECTED. Transi t and recei ve si gnal. Let float i f not used. 8 _ DTR I DATA TERMINAL READY i nput. Acti veLOW. Swi tchi ng off DTR can ei ther return modem to command state, di sconnect phone call, or reset modem. DTR should be set LOW when not used. 9 _ ANS I Answer i nput has two modes of operati on dependi ng on i ts state duri ng reset. 1. When ANS i s low duri ng reset the CH1787 CH1787 wi ll go off hook i n the answer mode, sendi ng answer tone conti nuously wai ti ng for an ori gi nati ng tone. Thi s mode of operati on i s used on a dedi cated non di al-up telephone li ne (leased li ne). 2. When ANS i s hi gh duri ng reset, the modem wi ll i ni ti ate an answer tone whenever ANS Pi n goes low duri ng normal operati ons. The modem wi ll send the answer tone for 30 seconds and then stop. If ANS i s sti ll low at the completi on of the 30 seconds, the modem wi ll attempt another answer tone sequence as long as ANS i s low. Used to manually answer an i ncomi ng call. 10 _ V/D O VOICE/DATA output i s used to swi tch between telephone and modem li ne use. When low the modem i s i n the control mode and a voi ce ci rcui t can be swi tched out, RXA, TXA when hi gh the modem i s i n the data mode and the i nput should be RXD/TXD. 11 RST1 I RESET i nput (acti ve hi gh). Thi s i nput must be asserted HIGH for at least 10 ms to reset the modem. RESET i s then returned LOW for normal operati on. If no system reset i s avai lable, let thi s pi n float to enable i nternal reset. 12 _ RI O RING INDICATION: Thi s si gnal follows the frequency of the ri ngi ng si gnal normally about 20 to 40 Hz for 2 seconds off for for 4 seconds. 13 N/C - No Connecti on. 14 _ DSR O DATA SET READY output. LOW i ndi cates handshaki ng wi th a remote modem i s i n progress, and/ or the data carri er of a remote modem i s detected. 15 _ ORA I ORA i s an i nput that i s acti ve low. When LOW i t wi ll di al one of two stored telephone numbers dependi ng on the state of the TST pi n. The numbers are stored i n NVRAM. One i s a user defi ned number that i s loaded i n by the user one ti me wi th the AT&ZO=(phone number) command. The other number i s a prestored number that i s located at Cermetek(408_) and i s i n a permanent loop back answeri ng on the second ri ng. CH1787 CH1787 wi ll attempt to connect wi th the stored number up to 15 tri es at 60 second i ntervals to obtai n a successful connecti on as long as ORA i s low. The state of DCD i ndi cati ng carri er desi gnates a successful connecti on. If ORA goes hi gh, further attempts to connect wi ll be termi nated. If after di sconnecti ng from a vali d connecti on, ORA sti ll low the modem wi ll be unresponsi ve unti l ORA i s placed hi gh then low. The FCC requi reds that automati c di ali ng attempts do not exceed 15 to the same number. TST low di al the user stored number. 16 _ TXD I TRANSMIT DATA. Seri al recei ve data i nput. Marki ng, or a bi nary 1 condi ti on i s transmi tted when a HIGH i s asserted. 17 DIR O DIR i s an output that i ndi cates when TXD data may be sent to the modem and when RXD data i s vali d from the modem. The user should moni tor thi s pi n or gate i t as shown i n Fi gure 4 to prevent data from bei ng erronously i nterpreted by the user's host processer. DIR tells when the TXD and RXD li nes are used for i nternal CH1787 CH1787 connecti on. When DIR i s hi gh, vali d data i s on RXD and TXD. When DIR i s low the user may i gnore RXD data and should not place any data on TXD si nce i t wi ll be i gnored by the CH1787 CH1787. 18 IRQ - 4.7KW resi stor to 5V 19 _ SLEEP O SLEEP output. A LOW i ndi cates modem i s i n low power i dle mode. Used to control power to other devi ces. See Fi gure 5. Regi ster S24 i s the sleep ti mer regi ster. When the modem i s i nacti ve for a peri od of ti me speci fi ed by S24, the CH1787 CH1787 wi ll peri odi cally power down by about 50% of i ts normal operati ng power. I/O li nes wi ll become undefi ned. The default for the CH1787 CH1787 i s that sleep mode i s i nhi bi ted. Thi s i s done by loadi ng 255 i nto S24. Note: (1) If VCC has a slow power up ramp time, the internal reset may be ineffective. Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 4 P IN N AM E I/O F U N C T ION 20 GND I GR OU N D . 21 _ DCD O D ATA C AR R IE R D E T E C T output. L OW i ndi cates a data carri er from a remote modem i s detected. DCD follows carri er i s the default. 22 _ HS O S P E E D IN D IC AT ION . Hi gh speed select output. A LOW on thi s pi n i ndi cates the modem i s operati ng at 2400bps. 23 _ ORG I Ori gi nate i nput (acti ve LOW) places to modem off hook i n the ori gi nati ng mode wi thout di ali ng. Used to make a connecti on on dedi cated leased li nes between two poi nts. The remote modem must be i n answeri ng mode. 24 NC - No Connecti on 25 NC - No connecti on. 26 NC - No connecti on. 27 SPK O SPEAKER - Audi o Output. See Fi gure 5. 28 _ TST I Test pi n i nput used i n conjuncti on wi th ORA to steer the di ali ng between a user stored number and a pre-stored Cermetek test number. See ORA descri pti on. 29 _ CON O Connect output i ndi cates a vali d 2400bps connecti on. Can be used i n place of DCD and HS to start the communi cati ons. Can be used to i ndi cate the start of an exchange of data. 30 _ HNG I The hang-up i nput pi n (acti ve LOW), forces the modem to di sconnect. The HNG pi n i s only functi onal when DCD i s acti ve (low). 31 _ RXD O R E C E IV E D ATA. Seri al recei ve data output. Recei ved MARKING or a bi nary 1 condi ti on i s i ndi cated by a HIGH. 32 VCC I 5 Volts + 5% 33 GND I GR OU N D . 34 _ AAR I AAR pi n i s an i nput (acti ve LOW). When asserted low then hi gh, CH1787 CH1787 wi ll auto answer duri ng a Ri ng cycle. AAR can be ti ed low pri mari ly to enable Auto Answer on the fi rst RING. AAR wi ll not overri de an AT auto answer condi ti on e.g., S0 > 1. Note: Noi se should be less than 50MV. Spare pins are available for custom functions. Contact Cermetek with your requirements. Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 5 AT[CR] Where: A and T must be upper case or lower case [CR] repesents carriage return The modem will respond with one of the following status messages, depending on whether it is optioned for abbreviated or English status messages. 0[CR] [CR][LF][OK][CR][LF] (Abbreviated form) (English form) Where: [CR] represents carriage return (ASCII 13) [LF] represents line feed (ASCII 13) The modem may be retrained any time while it is idle. Another attention sequence A/ is much like the AT sequence except it repeats the previously entered command specified with an AT prefix. When given, it must also be in upper case ASCII. No carriage return is needed. Cermetek Microelectronics, Inc. Modem States The modem can be in either a command state or a data mode state. When the modem is idle, it is in the command state. When a data call is in progress, it is in the data mode state. The modem does not recognize commands when in the data state. To recognize commands, the computer must send an escape sequence to the modem that forces it out of the data mode and into the command mode. The escape sequence consists of a guard time (a period where no characters are sent to the modem) followed by 3 escape characters, followed by a guard time again. At powerup, the guard time is set to 1 second minimum, and the escape character is set as +. These two parameters can be modified via registers S2 and S12. The modem will stay off-hook with its carrier on after the escape sequence is received. It returns an OK status message when it is ready to accept commands. You may re-enter the data mode by issuing the ONLINE command ATO [enter]. Document No. 603-0182 Rev. D (11/98) 6 Table 2 Register S0* S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S14* S16 S18* S21* S22* S23* S24 S25* S27* S28* Ch1787 Register Summary Function Ring to Answer On Ring Count Escape Code Character Carriage Return Character Line Feed Character Back Space Character Wait For Dial Tone Wait Time for Data Carrier Pause Time for Comma Carrier Detect Response Time Lost Carrier to Hang-up Delay DTMF Dialing Speed Escape Code Guard Time Bit Mapped Options Register Modem Test Options Test Timer Bit Mapped Options Register Bit Mapped Options Register Bit Mapped Options Register Sleep Mode Inactivity Time Delay to DTR Bit Mapped Options Register Bit Mapped Options Register Ampersand Commands *&Dn &F *&Gn *&Pn *&Sn &Tn &V *&Wn *Yn *&Zn *&Cn Data Terminal Ready Option Load Factory Defaults Guard Tone Option Make to Break Ratio Selection Data Set Ready Option Test Command Option View Active Configuration Store active profile Recall active profile Store telephone numbers Not supported Percent Commands %Dn %J Function Function DTMF Attenuation Load Secondary Factory Defaults NOTE: A detailed definition of all commands and registers is available from Cermetek Microelectronics, Inc. *= Commands that can be stored in NVRAM. *=S-Registers stored in NVRAM upon receipt of &W command AT COMMAND APPLICATIONS Table 3 Ch1787 AT Command Set Summary Basic Commands Function A T A A/ *Bn D *E Hn *Ln *Mn On P *Qn Sn Sn= Sn? *Vn *Xn + , ? *Yn Fn Z Attention Code Answer command Repeat Last Command Communications Standard Option Dial Command Off-Line Character Echo Option Switch Hook Control Option Speaker Volume Option Speaker Control Option On-Line Command Pulse Dial Result Code Display Option Select an S Register Write to an S Register Read an S Register Result Code Form Option Result Code Set/Call Progress Option Escape Code Sequence Pause Returns Last Addressed S Register Long Space Disconnect Option On Line Echo character Option Reset Pause , When placing a call from an office with a telephone connected to a PBX, it may be necessary to dial an access code (usually the digit 9) to get an outside line. Inserting a comma in the telephone number commands the modem to pause for a specific length of time. A factory default pause time is 2 seconds. Example: Dial 9, pause, dial number. Enter AT DT9, 1234567 Multiple commas may be used for a greater delay time. TOUCH TONE AND PULSE DIALING T and P The modem can use DTMF (touch-tones) or dial pulses when dialing a telephone number. If the dial command does not specify which type to use, the modern defaults to the type last specified. The power-on default value is P. Example: Pulse dial 9, pause, touch-tone dial number. Enter: AT DP9, T1234567 T1234567 Originate a Call in Answer Mode R The D command forces the modem into originate mode. To call an originate-only modem, dial the number and set the modem to answer mode via the R (reverse originate). Enter the R command at the end of the telephone number. Redial Last Number A/ Use A/, the repeat command, to redial the last telephone number dialed when a busy signal is received. Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 7 Return to Command State ; The modem can be forced to reenter the command state after dialing (without hanging up) by ending the dial command with a semicolon. This is useful when using the modem as an auto dialer. Example: Touch-tone dial 9, pause, dial number, return for command. Enter: AT DT9, 1234567; The Serial Interface Lines The module supports a full RS-232C/V RS-232C/V.24 serial interface. Signal levels are TTL rather than RS-232C RS-232C level compatible, which allows you to directly connect the modem to your hosts UART without level translating circuitry. A complete description of each signal follows under Pin Description. Result: OK Two of these lines are all that are required for proper modem operation: TXD, RXD and DTR. The modem is controlled by sending it serial commands over TXD and can be monitored by serial status messages returned on RXD. Automatic Answering The S0 register controls the number of rings that must occur before the modem answers a call. The register may range in value from 0-255 All other serial interface lines may be utilized for the convenience of your application but are not required by the modem. Unused outputs (from modem) should be left unconnected. Unused inputs should be tied to the proper logic level. See pin description. S0 DO NOT ANSWER TELEPHONE S1 ANSWER ON RING 1 S2 ANSWER ON RING 2 S3 ANSWER ON RING 3 S0=255 ANSWER ON RING 255 When S0 is set to 0, the modem will not auto-answer. Example: Assign the value 6 to S0 to set the modem to answer on the sixth ring. Enter: AT S0=6 Result: OK DIAL A NUMBER D The Dial command takes the form Dn, where n is a string of characters. In the simplest form, n will be only the digits of the phone number to be dialed. Example: Dial number. Enter: AT D1234567 D1234567 In response to this command, the modem dials the telephone number 123-4567 and then waits for carrier from a distant modem. If no carrier is detected within a given time (the default time is 30 seconds), the modem automatically releases the line and sends a NO CARRIER result code. If carrier is detected, the modem gives a CONNECT result code and goes on-line, permitting communication with the distant modem. Figure 5. Speaker Control Circuit-optional to allow for call progress monitoring. Phone Line Connection Guidelines 1) 2) 3) The Dial Command may also be issued without a telephone number. ATD causes the modem to pick up the telephone line without dialing a number. 4) CONNECTING TO THE HOST UART 5) Since a modem communicates data serially and most host products handle data in a parallel format, a UART is needed to make parallel-to-serial and serial-to-parallel translations. 6) 7) Cermetek Microelectronics, Inc. The mounting of the CH1787 CH1787 in the final assembly must be made so that it is isolated from exposure to any hazardous voltages within the assembly. Adequate separation and restraint of cables and cords must be provided. The circuitry from the CH1787 CH1787 to the telephone line interface must be provided in wiring that carries no other circuitry than that specifically allowed in the rules (such as A and A1 leads). Connection to phone line should be made through an RJ-11 RJ-11 jack. Traces from the modems RING and TIP pins to the RJ-11 RJ-11 jack must exceed 0.1 inch spacing to one another and 0.2 inch spacing to all other traces. The traces should have a nominal width of 0.020 inches or greater. The RING and TIP traces should be as short as possible and oriented to prevent coupling other high speed or high frequency signals onto the host circuit card. No additional circuitry other than that shown in the following Figure may be connected between the modem module and the RJ-11 RJ-11 jack. The CH1787 CH1787, the RJ-11 RJ-11 jack, the interfacing circuitry and traces in between, must be mounted on a circuit board with a 94 V-0 flammability rating. Document No. 603-0182 Rev. D (11/98) 8 8) 9) The supplied FCC registration label must be applied visibly on the outside of the host product. The host products User Manual must provide the user with instructions for connection and use as recommended in Section FCC Registration. MOUNTING THE MODEM The modem contains static-sensitive devices and should only be handled by personnel and in areas that are properly protected against static discharge. Changes in Attestation Procedure for Plugs and Jacks (Name of applicant) attests that the network interface plugs or jacks used on this equipment comply with and will continue to comply with the mechanical requirements specified in Part 68, Sub-part F, specifically the dimensions, tolerances and metallic plating requirements. The compliance of these connectors will be assured by purchase specifications and incoming inspection. Documentation of such specifications and/or inspections will be provided by the FCC within 30 days of their request for the same. There are two mounting techniques that are recommended for physically connecting the modem to your circuit card; 1) sockets, and 2) direct soldering. FOR YOUR USERS MANUAL The modem may be wave soldered on a circuit card. This part is hermetically sealed for normal wave soldering process. Type of Service: The (insert your product name) is designed to be used on standard device telephone lines. It connects to the telephone line by means of a standard jack called the USOC RJ-11C RJ-11C (or USOC FJ45S FJ45S). Connection to telephone-company-provided coin service (central office implemented systems) is prohibited. Connection to party lines service is subject to state tariffs. The socketing approach to mounting eliminates cleaning and desoldering concerns. When the socket is used, it must make a solid connection to all modem pins. Failure to do so will cause unreliable modem operation. Also, steps should be taken to assure that the module remains tightly seated in the socket after the host product is shipped. FCC REGISTRATION The CH1787 CH1787 is registered with the FCC (Federal Communications Commission) under Part 68. To maintain the validity of the registration, you must serve notice to the end user of the product that contains the modem of several restrictions the FCC places on the modem and its use. The following notice is recommended and should be included in the host products USER MANUAL. Also, the FCC requires that Cermetek make all repairs to the modem. If repair is necessary after the modem is installed in your product and has been delivered to your customer, the modem must be returned to you where it can be removed from the host product and then forwarded to Cermetek for repair. Cermetek Microelectronics, Inc. The Part 68 rules require the following or the equivalent information be provided to the end user of equipment containing a DAA: Telephone Company Procedures: The goal of the telephone company is to provide you with the best service it can. In order to do this, it may occasionally be necessary for them to make changes in their equipment, operations or procedures. If these changes might affect your service or the operation of your equipment, the telephone company will give you notice, in writing, to allow you to make any changes necessary to maintain uninterrupted service. Document No. 603-0182 Rev. D (11/98) 9 Table 4. CH1787 CH1787 System Data Mode Compatibility Specifications P arameter S p ecificatio n Asynchronous 2400, 1200, 600 bps character asynchronous. 0-300 bps asynchronous Asynchronous Speed Range P a ra m e t e r S p ecificatio n Receive Carrier Frequencies V.22 bis, V.22, 212A Originate +7Hz 2400Hz +7Hz Answer 1200Hz +7Hz TxD may differ +1%, -25% from modem output. Offsets will be corrected by adding/deleting stop bits. Bell 103 Answer 'space' 2025Hz +7Hz Answer 'mark' 2225Hz +7Hz Original 'space' 1070Hz +7Hz Original 'mark' 1370Hz +7Hz Asynchronous Format 8, 9, 10 bits, including start, stop, parity Receiver Sensitivity OFF to ON threshold-43 dam ON to OFF threshold-48 dam Telephone Line Interface Two-wire full duplex over public switched network. On-chip hybrid and billing delay timers. Modulation V.22 bis, 16 point QAM at 600 baud. V.22 and 2212A, 4 point, DPSK at 600 baud. 103 binary phase coherent FSK. Self Test Pattern Generator Alternate 'ones' and 'zeros' and error detector, to be used along with most loopbacks. A number indicating the bit errors detected is sent to DTE. Transmit Carrier Frequencies V.22 bis V.22, 212A Bell 103 mode Originate Answer 1200Hz+.01% 2400Hz+.01% Originate 'space' Originate 'mark' Answer 'space' Answer 'mark' Cermetek Microelectronics, Inc. 1070Hz+.01% 1270Hz+.01% 2025Hz+.01% 2225Hz+.01% Hysteresis 2 dB minimum Line Equalization Fixed compromise equalization, transmit. Adaptive equalizer for PSK/QAM, receive. Diagonostics Available Local analog loopback. Local digital loopback. Remote digital loopback. Request remote digital loopback. Local interface loopback modem with self test. Call Progress Tones Detected Computer Interface With speaker or quiet screen messages (no dial tone, busy, ring-back, modem answer tone and voice). IBM PC/XT/AT bus compatible with an 8250/16450/16550A 8250/16450/16550A UART as a serial controller. Document No. 603-0182 Rev. D (11/98) 10 Table 5. CH1787 CH1787 Electrical Specifications Ta=25OC S ym b o l C h ar ct r stc a ei i V cc Typ . M ax. U n is t 4. 5 7 5. 0 5. 5 2 V 50 40 16 75 mA mA mA 0. 3 0. 3 0. 4 0. 6 2 S uppl volage y t Ic c Mi . n V V V V S uppl C ur ent y r O f hook oper tng cur ent f ai r O n hook oper tng cur ent ai r P ow er dow n oper tng cur ent ai r VOL O ut utLow V olage p t (O L=0. m A ) C O N I 4 (O L=5. m A ) D I I 0 R (O L=1. m A ) S LE E P,D S R ,D C D ,H S ,R X D I 6 (O L=4m A ) V / I D VOH O ut utH i h V olage p g t (O H =- . m A ) C O N ,D I I 02 R (O H =- 00uA ) S LE E P,D S R ,D C D ,H S ,R X D I 1 (O H =- m A ) V / I 4 D VI L I putLow V olage n t TS T,O R G ,O R A ,H N G ,A A R ,A N S D TR ,TX D VI H I putH i h V olage n g t TS T,O R G ,O R A ,H N G ,A A R ,A N S D TR ,TX D V T+ P osii e H yst r si Thr shol f r R esetpi tv ee s e d o n 2. 7 V V T- N egatve H yst r si Thr shol f r R esetpi i ee s e d o n 1. 6 V In certain circumstances, it may be necessary for the telephone company to request information from you concerning the equipment, which you have connected to your telephone line. Upon request of the telephone company, provide the FCC registration number and the ringer equivalence number (REN); both of these items are listed on the equipment label. The sum of II of the RENs on your telephone lines should be less than five in order to assure proper service from the telephone company. In some cases, a sum of five may not be useable on a given line. If Problems Arise: If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line, as it may cause harm to the telephone network. If the Telephone Company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible. When you are notified, you will be given the opportunity to correct the problem and informed of your right to file a complaint with the FCC. Contact your telephone company if you have any questions about your phone line. In the event repairs are ever needed on the (insert your product name), they should be performed by (insert your company name) or an authorized representative of (insert your company name). For information contact: (insert your company address). DEFAULT STATUS, PERFORMANCE, AND SPECS Default Configuration Profile Async mode selected 2400bps Bell 212A operation at 1200bps Even parity Cermetek Microelectronics, Inc. 4. 5 4 2. 4 4. 8 1 V V V 0. 5 9 0. 8 3. 3 2. 4 V V V V Auto answer disabled Command echo ON All result codes enabled extended Wait for dial tone before dialing 2 seconds Detects busy signal Full word result codes Pulse dial make/break ratio = 39/61 DSR enabled Modem enabled DTR DCD enabled Speaker enabled but off when receiving carrier Speaker volume set to medium Local modem will grant RDL request from remote modem Guard tones disabled Minimum DTR pulse width = 0.1 seconds Ring count 01 (CH1786 CH1786) Escape code character = 43 Carriage return character = 13 Line feed character = 10 Back space character = 08 Duration of wait for dial tone = 02 seconds Duration of wait for carrier after dialing = 30 seconds Duration of deal pulse (comma) = 02 seconds Carrier detect response time = 0.1 seconds Escape code guard time = 1 second Length of use after comma = 2.0 seconds Last carrier to hang up delay = 0.1 seconds DTMF interdigit delay = 0.1 seconds DTMF Attenuation = -4dB Sleep mode inactivity time = 5 seconds Long space disconnect disabled Document No. 603-0182 Rev. D (11/98) 11 Table 6. CH1787 CH1787 Electrical Specifications Table 7. Other Performance Specifications Cermetek Microelectronics, Inc. Document No. 603-0182 Rev. D (11/98) 12 Table 8. Temperature Options Operating Temperature Model o o 0 C to +70 C CH1787 CH1787 -40oC to +85oC CH1787ET CH1787ET Figure 7. CH1787 CH1787 Physical Dimensions and Pin Functions Cermetek microelectronics 406 TASMAN DRIVE . SUNNYVALE, CALIFORNIA 94089 . TEL: (408) 752-5000 FAX: (408) 752-5004 E-mail: cermstaf@cermetek.com website: www.cermetek.com Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by Cermetek in this publication is believed to be accurate and reliable. However, no responsibility is assumed by Cermetek for its use, or for any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or patent rights of Cermetek. ©1998 Cermetek Microelectronics Cermetek Microelectronics, Inc. Printed in U.S.A. Document No. 603-0182 Rev. D (11/98) 13