
12
INDUSTRIAL TEMPERATURE RANGE
NW6005 ENHANCED TYPE II CALLER ID DECODER
CAS
Mark
Message
CPE off-hook
CPE mutes handset and
disable keypad
CPE unmutes handset and
enable keypad
A
B
C
D
E
F
G
A/B wires
PWDN
FSKEN
CPE sends ACK
STD
...
Data
CD
DR
DCLK
DATA
Hybrid
DT-ASEN
Notes:
1) A= 75 - 85 ms, B= 0 -100 ms, C= 55 - 65 ms, D= 0 - 500 ms, E= 58 - 75ms, F depends on data length, G
≤ 50 ms.
2) If AC power is not available, the designer may use the line power when the CPE goes off-hook and use battery power while on-hook. The
CPE should also be CID (on-hook) capable .
3) If the end office fails to send the FSK signal, the CPE should disable FSKEN and unmute the handset and enable the keypad after this
interval.
4) When FSK signal is not expected, the FSKEN should be set low to disable the FSK demodulator.
5) FSKEN should be high as soon as the CPE has finished sending the acknowledgement signal ACK.
6) FSKEN should be low when CD become inactive.
7) PWDN, FSKEN and Hybrid DT-ASEN are internal signals decoded from Control Bits CB2-0.
8) When CB0 is low, both DR and DCLK pins are unused.
Note 1
Note 2
Note 3
Note 4
Note 5
Note 6
Figure 12. Bellcore Off-hook Data Transmission Timing Diagram
Note7
Note 8