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SM8221 Datasheet(PDF) 6 Page - Nippon Precision Circuits Inc |
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SM8221 Datasheet(HTML) 6 Page - Nippon Precision Circuits Inc |
6 / 8 page NIPPON PRECISION CIRCUITS-6 SM8220/SM8221 FUNCTIONAL DESCRIPTION Bell 202 ITU-T V.23 Modulation Type Continuous - phase binary frequency shift keying (FSK) Logical 1 (Mark) 1200 ± 12Hz 1300 ± 22Hz Logical 0 (Space) 2200 ± 22Hz 2100 ± 22Hz Carrier Frequency 1700Hz 1700Hz Transmission rate 1200BPS 1200BPS Data format serial, asynchronous serial, asynchronous The SM8220/SM8221 Calling Number Identification Receiver IC is a device compatible with the Bellcore GR- 30-CORE for transmitting asynchronous voice-band data to Customer Premises Equipment (CPE) from a serving Stored Program Controlled Switching System (SPCS) or a Central Office (CO). This data transmission technique is applicable in a variety of services such as Calling Number Delivery (CND), Calling Name Delivery (CNAM). With these services, a subscriber will have the ability to display a message containing the phone number of the calling party, the name of a calling party, the date and the time. The data signaling interface should conform to Bell 202 and ITU-T V.23 specification, which is: 101010... 1 Data 1st Ring 2nd Ring Channel Seizure Signal Mark Signal * Message Type Word Message Length Word Message Words * Checksum Word * *: Mark bits Single Message Format 101010... 1 Data 1st Ring 2nd Ring Channel Seizure Signal Mark Signal * Message Type Word Message Length Word * Multi Message Format * Parameter Type Word Parameter Length Word * Parameter Words Checksum Word * Parameter Type Word Parameter Length Word * * * * Parameter Type Word Parameter Length Word * * Parameter Words Parameter Words *: Mark bits Bellcore GR-30-CORE Data Format |
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