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ISDN S-INTERFACE MODULES
Through-Hole, Dual, 1500 Vrms
Application Notes
The S-Interface is the standardized four wire digital telephone
access point defined by the CCITT I-Series recommendations
for the Integrated Service Digital Network. This “basic rate
access” accommodates two 64 Kbps “B-channels” for informa-
tion, one 16 Kbps “D-channel” intended for signaling and con-
trol, and 48 Kbps for framing and other purposes, giving a total
rate of 192 Kbps. The CCITT physical layer recommends that
the user network interface be transformer coupled as shown in
our typical application notes.
T632.A (7/98)
Figure 1: Typical S-Interface Application Circuit for Siemens: PEB 2086*
Figure 2: Typical S-Interface Application Circuit for Motorola: MC 145474/5*
*Note: Refer to Silicon Vendors Application Notes for more details on power supply connection and specific component values.
R1
T5012
PEB 2086
MC 145474/5
R1
R2
R5
R6
R7
R3
R8
R4
R2
R3
R4
R5
R6
D1
V
DD
D2
D3
D4
D5
D7
D6
D8
D9
D1
D2
D3
D4
D5
D6
D7
D8
D9
R9
L1
L2
C1
Sx na
Sx nb
SR na
SR nb
T5011
Txp
Txn
Rxp
Rxn
9
*8
7
1
3*
18
10
*11
12
5
16*
14
2 :1
2 :1
9
*8
7
1
3*
18
10
*11
12
5
16*
14
1 :1
V
DD
ZD2
V
DD
V
DD
V
DD
