mt88ebnr Zarlink Semiconductor, mt88ebnr Datasheet - Page 25

• Manufacturer Part Number: mt88ebnr
• Description: 4-wire Calling Number Identification Circuit 2 4-wire Cnic2 Semiconductor Inc
• Manufacturer: Zarlink Semiconductor

Notes:
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
2) Non-FSK signals such as CAS, speech and DTMF tones are in the same frequency band as FSK. They will be demodulated and
3) The MT88E45B may be put into FSK mode as soon as the CPE has finished sending the acknowledgment signal ACK. TR-NWT-
4) The MT88E45B should be taken out of FSK mode when CD has become inactive, or after 5 framing errors have been detected, or
5) In an unsuccessful attempt where the end office does not send the FSK signal, the CPE should unmute the handset and enable the
6) The total recognition time is t
7) The total tone absent time is t
8) PWDN, Hybrid CASen and FSKen are internal signals decoded from CB0/1/2.
9) This signal represents the mode of the DR/STD pin.
Hybrid CASen
use battery power while on-hook. The CPE must also be CID (on-hook) capable because a CIDCW CPE includes CID functionality.
give false data. Therefore the MT88E45B should be taken out of FSK mode when FSK is not expected.
000575 specifies that ACK = DTMF ‘D’ for non-ADSI CPE, ‘A’ for ADSI CPE.
after 150ms of continuous mark signal or space signal has been received. The framing errors need not be consecutive.
keypad after interval D has expired.
is the comparator threshold (refer to Figure 55 for details).
is the comparator threshold (refer to Figure5 5 for details).
TIP/RING
FSKen
PWDN
Note 8
Note 8
Note 8
DCLK
OSC2
Note 9
ST/GT
Note 9
DATA
STD
EST
CD
DR
Figure 16 - Application Timing for Bellcore Off-hook Data Transmission, e.g., CIDCW
Note 1
CPE goes off-hook
Note 2
t
t
REC
t
DP
t
PU
GP
REC
ABS
Note 6
= t
CAS
= t
A
GP
GA
Note 7
+ t
+ t
DP
DA
, where t
, where t
CPE mutes handset & disables keypad
t
B
t
ABS
V
DA
TGt
t
GA
Zarlink Semiconductor Inc.
GP
CPE sends
GA
MT88E45
is the tone present guard time and t
ACK
is the tone absent guard time and t
C
25
Note 3
Note 5
t
CP
D
Mark
E
Data
Data
DP
DA
F
is the tone present detect time. V
is the tone absent detect time. V
CPE unmutes handset
and enables keypad
Note 4
G
A = 75-85 ms
B = 0-100 ms
C = 55-65 ms
D = 0-500 ms
E = 58-75 ms
F = feature specific
G
t
CA
50 ms
Data Sheet
TGt
TGt