MT9092
LTx
VBias
LRx
HSPKR+
HSPKR-
M+
C4b
F0b
C4i
CCITT ISDN
Reference
Point S
F0i
DSTi
DSTo
Handset
MT9092
HPhone-∏
MT8930
SNIC
with
HDLC
Controller
Interface
5 Volts
DSTo
DSTi
M-
Digital
Telephone
with
DC to DC
Converter
MIC+
MIC-
Microphone
Speaker
HDLC
Controller
AD0-7
SPKR+
SPKR-
IRQ
IRQ
CS SCLK
DATA1
(ALE) (RD) (WR)
AS
E
R/W
(ALE) (RD)
(WR)
AD0-7
IRQ
8051
INTEL
MCS-
51
Figure 10 - CCITT ISDN Voice/Data Terminal Equipment - TE1
5 volts
HSPKR+
C4
F0
C4i
DC to DC
HSPKR-
M+
CONVERTER
F0i
MT8972
DNIC
Handset
MT9092
HPhone-∏
Digital
Telephone
with
Lin
DSTi
DSTo
DSTi
M-
ZT
DSTo
MIC+
MIC-
HDLC
Controller
Microphone
Twisted Pair
to Central
PBX
Lout
SPKR+
SPKR-
Speaker
10.24 MHz
IRQ SCLK CS DATA1
INTEL
MCS-51
Figure 11 - Voice/Data Digital Telephone Set Circuit
7-34
MITEL [ MITEL NETWORKS CORPORATION ]
