MT8843AS 데이터 시트보기 (PDF) - Mitel Networks

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MT8843AS

Calling Number Identification Circuit 2

Mitel Networks 

Preliminary Information

MT8843

TIP/RING

TRIGout

PWDN

OSCout

1st Ring

A

Ch. seizure

B

C

Mark

D

Data Packet

E

2nd Ring

F

Note 1

Note 3 Note 1

Note 4

FSKen

CD

DR

DCLK

DATA

Note 2

tCP

..101010..

tCA

Data

A = 2sec typical

B = 250-500ms

C = 250ms

D = 150ms

E = feature specific

Max C+D+E = 2.9 to 3.7sec

F ≥ 200ms

Figure 17 - Input and Output Timing for Bellcore On-hook Data Transmission Associated with

Ringing, e.g., CID

Notes:

This on-hook case application is included because a CIDCW (off-hook) CPE should also be capable of receiving on-hook data

transmission (with ringing) from the end office. TR-NWT-000575 specifies that CIDCW will be offered only to lines which subscribe to

CID.

1) The CPE designer may choose to enable the CNIC2 only after the end of ringing to conserve power in a battery operated CPE. CD is not

activated by ringing.

2) The CPE designer may choose to set FSKen always high while the CPE is on-hook. Setting FSKen low prevents the FSK

demodulator from reacting to other in-band signals such as speech, CAS or DTMF tones.

3) The microcontroller in the CPE powers down the CNIC2 after CD has become inactive.

4) The microcontroller times out if CD is not activated.

5-39

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