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參數(shù)資料
| 型號： | KS8630D |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | ENHANCED CALLING LINE IDENTIFIER WITH CALL WAITING |
| 中文描述： | 增強電話線呼叫等待標(biāo)識符 |
| 文件頁數(shù)： | 19/23頁 |
| 文件大?。?/td> | 258K |
| 代理商： | KS8630D |
ENHANCED CALLING LINE IDENTIFIER WITH CALL WAITING
KS8630D
19
PRELIMINARY
OFF-HOOK OPERATION
Off-Hook means that the telephone set is currently being used. The CIDCW (Calling Identity on Call Waiting)
service means displaying a different Caller’s Identity on the LCD pannel while still on the line with another call.
Since the telephone set is being used, the operator must send a CAS (CPE Alerting Signal) before sending the
caller ID information, to initialize the CIDCW service. The performance of subscriber’s phone (CPE) is a error rate
of the CAS signal detection when the speech signal interfered as a noise. If talk-down (missing CAS) occurs, the
caller ID information can be lost, and if talk-off (false response) occurs, the caller at the far end will hear unwanted
noise. CAS is transmitted in the same frequency band as the voice signals, so that the talk-off and the talk-down
performance is very important to decide the efficiency of Caller ID system. KS8630D uses the BPF and patented
digital detection algorithm to detect the Dual Tone CPE Alerting Signal, so it is possible to minimize the talk-off
and the talk-down error ratio.
BT (British Telecom) system
Figure 19. KS8630D's Timing Diagram in BT, Off-Hook Status
If the talk-off occurs, or if the microcontroller has finished transmitting FSK data, a high state pulse must be
transmitted to the PD ( pin # 8 ) to re-initialize the KS8630D same as FIG 19.
Tone Alert
MARK
NETWORK
Start
Point
40~50ms
Silence
80~85ms
ACK
100ms
65~75ms
5~100ms
Detect
Alert Signal
Disable
Speech path
Send ACK
Network Speech path
restored within 100ms
Silence
If no message detected,
restore speech path
Terminal
Equipment
Waiting for
ACK signal
Detect
ACK signal
MODE
PD
Message
45~75ms
INTB
T
MODED
T
AMODE
T
MINT
T
MKINT
T
MSGPD
T
PD
W
DATA
clock
DCLK
T
INTD2
T
INTD2
data
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