MT8979 ISO-CMOS
1
2
VDD
IC
TxA
28
27
26
25
24
23
22
21
20
TxB
DSTo
NC
40
44 43 42 41
6 5 4 3
2
1
3
F0i
E2i
NC
NC
RxMF
7
NC
NC
RxA
39
4
5
8
38
37
36
35
34
33
32
31
30
29
9
TxMF
RxA
RxB
10
11
12
13
14
15
16
NC
RxB
6
7
RxMF
TxMF
C2i
RxD
NC
RxD
CSTi1
NC
NC
C2i
NC
NC
NC
NC
NC
CSTi1
8
NC
NC
NC
ADI
9
NC
10
11
12
13
14
DSTi
NC
CSTo
NC
ADI
19
18
17
18 19 20 21 22 23 24 25 26 27 28
17
16
15
CSTi0
E8Ko
XSt
XCtl
VSS
44 PIN PLCC
28 PIN CERDIP/PDIP
Figure 2 - Pin Connections
Pin Description
Pin #
Name
Description
DIP PLCC
1
2
3
2
3
5
TxA
TxB
Transmit A (Output): A split phase unipolar signal suitable for use with TxB and an
external line driver and transformer to construct the bipolar line signal.
Transmit B (Output:) A split phase unipolar signal suitable for use with TxA and an
external line driver and transformer to construct the bipolar line signal.
DSTo
Data ST-BUS (Output): A 2048 kbit/s serial output stream which contains the 30 PCM or
data channels received from the CEPT line.
4
5
4
9
NC
No Connection.
RxA
Receive A (Input): Received split phase unipolar signal decoded from a bipolar line
receiver.
6
7
8
10
11
13
RxB
RxD
Receive B (Input): Received split phase unipolar signal decoded from a bipolar line
receiver.
Received Data (Input): Input of the unipolar data generated from the line receiver. This
data may be NRZ or RZ.
CSTi1
Control ST-BUS Input #1: A 2048 kbit/s stream that contains channel associated
signalling, frame alignment and diagnostic functions.
9
NC
NC
ADI
No Connection.
No Connection.
10
11 17
Alternate Digit Inversion (Input): If this input is high, the CEPT timeslots which are
specified on CSTi0 as voice channels are ADI coded and decoded. When this bit is low it
disables ADI coding for all channels. This feature allows either ADI or non-ADI codecs to
be used on DSTi and DSTo.
12 19
CSTi0
Control ST-BUS Input #0: A 2048 kbit/s stream that contains 30 per channel control
words and two Master Control Words.
4-162
MITEL [ MITEL NETWORKS CORPORATION ]
