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參數(shù)資料
| 型號： | SC88E43 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | EXTENDED VOLTAGE CALLING NUMBER IDENTIFICATION CIRCUIT 2 |
| 中文描述： | 更廣的電壓主叫號碼識別電路2 |
| 文件頁數(shù)： | 24/25頁 |
| 文件大小： | 389K |
| 代理商： | SC88E43 |
Silan
Semiconductors
SC88E43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
24
A/B Wires
STD
PWDN
t
DP
ESt
St/GT
FSKen
CD
DR
DCLK
DATA
OSCout
Data
CPE goes off-hook
Mark
A
B
C
D
E
G
t
DA
t
GP
t
REC
t
GA
V
TGt
t
ABS
CAS
Note 1
t
CP
t
PU
A=75--85mS
B=0--100mS
C=55--65mS
D=0-500mS
E=58--75mS
F=feature specific
G<50mS
F
(Note 6)
Note 7
Note 8
t
CA
t
CP
Note 5
Note 3
Note 4
Note 2
CPE mutes hangset & disables keypad
ACK
CPE sends
Data Packet
CPE unmutes handset
and enables keypad
Figure 20: Input and Output Timing for Bellcore off-hook Data Transmission,e.g., CIDCW
Note:
1. In a CPE where AC power is not available, the designer may choose to switch over to line power when the CPE goes off-hook and
use battery power while on-hook. The CPE should also be CID (on-hook) capable because TR-NWT-000575 specifies that CIDCW
will be offered only to lines which subscribe to CID.
2. Non-FSK signals such as CAS, speech and DTMF tones are in the same frequency band as FSK. They will be demodulated and
give false data. The FSKen pin should be set low to disable the FSK demodulator when FSK is not expected.
3. FSKen may be set high as soon as the CPE has finished sending the acknowledgment signal ACK. TR-NWT-000575 specifies that
ACK=DTMF D for non-ADSI CPE, A for ADSI CPE.
4. FSKen should be set low when
CD
has become inactive.
5. In an unsuccessful attempt where the end office does not send the FSK signal, the CPE should unmute the handset and enable the
keypad after this interval.
6. SR-TSV-002476 states that it is desirable that the CPE have an on/off switch for the CAS detector. See SW1 in Figure 4.
7. The total recognition time is t
REC
=t
GP
+t
DR
,where T
GP
is the tone present guard time and t
DP
is the tone present detect time (refer to
section “Dual Tone Detection Time” on page 11 for details). V
TGt
is the comparator threshold (refer to Figure 4).
8. The total tone absent time is t
ABS
=t
GA
+t
DA
, where tGA is the tone absent guard time and t
DA
is the tone absent detect time (refer to
section ” Dual Tone Detection Time” on page 11 for details). V
TGt
is the comparator threshold (refer to Figure 4).
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