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Cermetek Microelectronics, Inc.

High Speed Modem and FAX Family



2003 Cermetek Microelectronics, Inc.

Page 19

Document No. 607-0003 Revision K3 (09/03)

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, Cermetek assumes no responsibility 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.

Printed in U.S.A

406 TASMAN DRIVE

|

SUNNYVALE CA 94089

|

LOCAL: 408-752-5000

|

TOLL FREE: 1-800-882-6271

|

FAX: 408-752-5004

CERMETEK WEB SITE:

http://www.cermetek.com

|

EMAIL:

sales@cermetek.com

iModem Network WEB SITE:

http://www.imodem.net/

or

https://sunnyvale.imodem.net/

NOTES:

1.  All dimensions are inches.
2.  Case dimensions are n 0.02 inches.
3.  Pin length is n 0.03 inches.
4.  Cermetek recommends that 0.04 inch diameter plated through holes are used with 0.060 inch

diameter pads.

5. Pin spacing are nominal.
6. Low Profile (0.550 inches maximum) case available 8/1/01 upon special request.

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Summary of Contents for CH1794

Page 1: ...mum DTE rate of 57 6kbps for the CH1794 115 2kbps for the CH1799 and 230 4kbps for the CH2056 A choice of error correcting schemes is available including MNP 10 for cellular telephone applications The HS Modem family supports Send and Receive FAX The CH1799LL operates exclusively on non voltage bearing leased The HS Modem family is pin compatible with Cermetek s low cost CH1786 V 22bis 2400bps mod...

Page 2: ...amily of products satisfies U S and Canadian requirements and will meet other international approval agency requirements that specify these levels of isolation The TBR ETBR variants also meet the European TBR21 requirements Pins 1 and 2 function as both input and output connections to the PSTN To maximize field reliability in hostile environments for Canadian approval for UL compliance and also op...

Page 3: ...iods the power may be switched off using external circuitry and then reapplied when the HS Modem s RI pin becomes active The HS Modem can thus be powered down to zero Referring to Figure 2 the controller activates the relay switch supplying power 5V to the HS Modem In this configuration the ring signal is used to wake up the HS Modem when the HS Modem is in the power down state The internal struct...

Page 4: ...auses an overall throughput data rate penalty Voice Tone Injection Port The HS Modem Family provides pin T1 to allow the user to share the PSTN line interface associated with the modem for voice and DTMF applications Figure 5 contains a schematic which uses a 5 Volt single supply operational amplifier and indicates one possible configuration for voice tone utilization Refer to Cermetek Application...

Page 5: ...ed by 3 escape characters followed by a second guard time At power up the guard time is set to 1 second and the escape character is set as Note that a 50 msec delay is required between escape characters These two parameters can be modified via registers S2 and S12 respectively The HS modem will stay off hook with its carrier on after the escape sequence is received The HS Modem will return an OK s...

Page 6: ...TE speed and parity odd even mark space or none These activities are briefly described below HS Modem Reset Upon applying power to the HS Modem the HS Modem automatically generates an internal reset pulse The user can also reset the modem externally by applying a high going reset pulse to the RST pin for at least 10 msec after the 5V power supply has stabilized Delay sending commands to the HS Mod...

Page 7: ...1799LL is a leased line version of the CH1799 Whereas the CH1799 requires an active voltage bearing or wet PSTN line for normal operations typically 48VDC on hook line voltage the CH1799LL is designed to operate over a non voltage bearing or dry line The CH1799LL will only operate properly on a dry line Damage will occur if used on a wet line The CH1799LL does not support ring detect but does supp...

Page 8: ...odem DTR should be set LOW when not used 14 DSR O DATA SET READY LOW indicates handshaking with a remote modem is in progress and or the data carrier of a remote modem has been detected 15 RI O RING INDICATION This signal follows the frequency of the ringing signal and is normally about 20 to 40 Hz for 2 seconds on with 4 seconds off 16 CTS O CLEAR TO SEND Active LOW Indicates that the modem is re...

Page 9: ...f Hook and Return to Command State The modem can be forced to reenter the command state after going off hook by issuing the ATDT command with a semi colon This is useful when using the modem with an independent DTMF tone generator Example Touch tone dial 9 pause go off hook return for additional AT commands Enter ATDT9 T CR Result OK CR LF Automatic Answering S0 0 DO NOT ANSWER TELEPHONE S0 1 254 ...

Page 10: ...ke all repairs to all products in the HS Modem family If repairs are necessary after installation of the HS Modem and the end product has been delivered to the end user the end product must be returned to the end product supplier where the HS Modem can be removed and then forwarded to Cermetek for repair The following notice is recommended and should be included in the end product s user manual FO...

Page 11: ...ion Long space disconnect disabled Speaker enabled but off when receiving carrier Speaker volume set to low Local modem will not grant RDL request from remote modem Guard tones disabled Minimum DTR pulse width 05 seconds Ring count 00 Escape code character 43 Flash to on hook 70 msec Auto speed detection enabled DTE connect speed connect messages Back space character 08 BS Carriage return characte...

Page 12: ... X X X X X 56 CARRIER 24000 X X X X X 57 CARRIER 26400 X X X X X 58 CARRIER 28800 X X X X X Table 5B CH1799 Extended Result Codes Continuation Result Code Form n is ATXn Command Terse or Short Verbose or Long 0 1 2 3 4 59 CARRIER 16800 1 X X X X 61 CARRIER 21600 1 X X X X 62 CARRIER 24000 1 X X X X 63 CARRIER 26400 1 X X X X 64 CARRIER 28800 1 X X X X 66 Compression Class 5 X X X X X 67 Compressio...

Page 13: ...Directory n 0 to 3 E0 Turn off command echo E1 Turn on command echo Table 6A Summary of Basic AT Commands Continuation Command Function H0 Initiate a hang up sequence H1 If on hook go off hook and enter command mode L0 Set low speaker volume L1 Set low speaker volume L2 Set medium speaker volume L3 Set high speaker volume M0 Turn Speaker off M1 Turn Speaker on during hand shaking and turn speaker ...

Page 14: ...es are displayed in the single line format MS Select modulation ERROR CORRECTING COMMANDS C0 Disable data compression C1 Enable MNP 5 data compression C2 Enable V 42bis data compression Command Function C3 Enable both V 42bis and MNP 5 compression A0 Set maximum block size in MNP to 64 A1 Set maximum block size in MNP to 128 A2 Set maximum block size in MNP to 192 A3 Set maximum block size in MNP ...

Page 15: ...Status T 0 S17 Reserved S18 Test Timer 0 255 Seconds 0 S21 V 24 General Bit Mapped Options Status 52 34h S22 Speaker Results Bit Mapped Options Status 117 75h S23 General Bit Mapped Options Status 62 3Dh S24 Reserved S25 Delay to DTR Off 0 255 Sec or 0 01 sec 5 S26 RTS to CTS Delay 0 255 0 01 seconds 1 S27 General Bit Mapped Options Status 73 49h S28 General Bit Mapped Options Status 0 S30 Disconn...

Page 16: ...mponents are required to maintain conveyed FCC Part 68 approval for all HS Modems excluding the CH1799LL B For CH1799LL the required surge protection identified as D1 in dashed Box 2 must be supplied externally The purchaser must include some form of surge protection as described herein to maintain conveyed FCC Part 68 approval Refer to Application Note 130 for a list of recommended suppliers C In...

Page 17: ...ent RST 500 µA Cp Capacitive Load TXD DTR RTS Capacitive Load RST 10 8 pF pF Test conditions VCC 5V 10 Temp 0 C to 70 F unless otherwise stated Output Load 50 pF one TTL Table 9 HS Modem Electrical Specifications Parameter Min Typ Max Units Comments Off Hook Impedance 20 Ohm Trans Hybrid Loss 25 dB 600 Ohm RXA TXA Ring Voltage Loop 110V 250V VPP On 48VDC line voltage for sustained periods Line Loo...

Page 18: ...Approved UL 1950 Listed 0 C to 70 C CH1799ET Full Function 33 6kbps FCC Part 68 Approved UL 1950 Listed 40 C to 85 C CH1799LL Full Function 33 6kbps FCC Part 68 Approved UL 1950 Listed 0 C to 70 C CH1799TBR Full Function 33 6kbps FCC Part 68 Approved UL 1950 Listed TBR21 Compliant 0 C to 70 C CH1799ETBR Full Function 33 6kbps FCC Part 68 Approved UL 1950 Listed TBR21 Compliant 40 C to 85 C CH2056 ...

Page 19: ... under any patents or patent rights of Cermetek Printed in U S A 406 TASMAN DRIVE SUNNYVALE CA 94089 LOCAL 408 752 5000 TOLL FREE 1 800 882 6271 FAX 408 752 5004 CERMETEK WEB SITE http www cermetek com EMAIL sales cermetek com iModem Network WEB SITE http www imodem net or https sunnyvale imodem net NOTES 1 All dimensions are inches 2 Case dimensions are nominal 0 02 inches 3 Pin length is nominal...

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