S1C05251 Timing Chart; Bellcore On-Hook Data Transfer; Bellcore Off-Hook Data Transfer - Epson S1C05251 Technical Manual

5 ELECTRICAL CHARACTERISTICS

5.10 S1C05251 Timing Chart

5.10.1 Bellcore On-Hook Data Transfer

INP/INN
#RDRC
#IRQ
PDWN
MODE0
#DET
SDI
SDO
#SCLK
OSC4

5.10.2 Bellcore Off-Hook Data Transfer

CPE→Off-Hook
INP/INN
#RDRC
#IRQ
PDWN
MODE0
#DET
SDI
SDO
#SCLK
OSC4
26
1st RING FSK
after receiving last data
FSK/read mode
Ring detection
Carrier detection
Figure 5.10.1 Bellcore on-hook data transfer timing chart
CPE→Receiver muted
SAS CAS
DTMF D transmitted from CPE
Power-on state maintained when receiver
is off-hook to detect CAS tone
CAS/write mode
FSK mode must be set to prevent failure in carrier detection after sending ACK
CAS tone detection
Control data bits written
Serial clock
Figure 5.10.2 Bellcore off-hook data transfer timing chart
data transfer 2nd RING
Power-down due to timeout
Power-down
Ring detection
Receive data
Serial clock
CPE→Receiver muting released
ACK FSK data transfer
Placed in CAS mode
after receiving last data
FSK/read mode
Carrier detection
Receive data
Serial clock
EPSON
No carrier
S1C05251 TECHNICAL MANUAL