psb4595 ETC-unknow, psb4595 Datasheet - Page 23

• Manufacturer Part Number: psb4595
• Description: Analog Line Interface Solution Alis
• Manufacturer: ETC-unknow

4.3
Figure 11 Ring Signal Flow Graph
These data paths operate only when the ALIS is in Ringing state.
4.3.1
The Caller ID receiver meets Bellcore specifications TR-NWT-000030 and
SR-TSV-002476 for Caller ID. In this service, the calling party’s information (Calling Line
Identification Presentation (CLIP)) is transmitted in the silent interval between the first
and second ring. ALIS receives and stores up to 4096 bits of the 1200 baud FSK
(Frequency Shift Keying) signal. The decoding scheme meets the Bell 202 and ITU-T
V.23 specifications.
The FSK signal which contains the caller information is converted to a 1-bit data stream
by a comparator in order to minimize power consumption. Down-sampling steps are
performed in fast digital hardware filters. To decode the caller ID, bandpass filtering,
Hilbert transformation and other functions are implemented. The output CID-out is
sampled at 1200 baud, and stored in the CID-RAM.
Semiconductor Group
comparator for CID
ALIS Ring and Caller ID Signal Flow Graph
Caller ID (CID) Path
CID out
user-programmable block
CIDL
CIDH
fixed filter block
CIDBP
RLM
fixed functional block
23
RIM
RIM
FIX
Analog Line Interface Solution
CIDL
CIDH
CIDBP
RLM
ADC
RIMFIX
RIM
DAC
ADC
DAC
Legend:
PSB 4595 / PSB 4596
ALIS Implementation
Caller ID Lowpass
Caller ID Hilbert Transformer
Caller ID Bandpass
Ring Level Metering
Analog-to-Digital Converter
Ringer Impedace Filter Fixed Part
Ringer Impedace Filter
Digital-to-Analog Converter
Tip/Ring
Data Sheet 06.98