SM8220 Datasheet, PDF (6/8 Pages) Nippon Precision Circuits Inc – Calling Number Identification Receiver IC

SM8220/SM8221
FUNCTIONAL DESCRIPTION
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:
Modulation Type
Logical 1 (Mark)
Logical 0 (Space)
Carrier Frequency
Transmission rate
Data format
Bell 202
ITU-T V.23
Continuous - phase binary frequency shift keying (FSK)
1200 ± 12Hz
1300 ± 22Hz
2200 ± 22Hz
2100 ± 22Hz
1700Hz
1700Hz
1200BPS
1200BPS
serial, asynchronous
serial, asynchronous
Bellcore GR-30-CORE Data Format
Single
Message
Format
1st Ring
101010... 1
Data
Channel
Seizure
Signal
Mark
Signal
Message
Message
Type * Length *
Word
Word
Message
Words
2nd Ring
*
Checksum
Word
*: Mark bits
Multi
Message
Format
1st Ring
101010... 1
Data
2nd Ring
Channel
Seizure
Signal
Mark
Signal
Message
Message
Parameter Parameter
Type * Length * Type * Length *
Word
Word
Word
Word
Parameter
Words
*
Parameter Parameter
Type * Length *
Word
Word
Parameter
Words
Parameter Parameter
*
Type * Length *
Word
Word
Parameter
Words
*
Checksum
Word
*: Mark bits
NIPPON PRECISION CIRCUITS-6