TEW4923 is designed/approved for

use as an input/output transformer

in the ISDN S-Interface.

Features

•

Certified to the safety re-

quirements of :

EN41003 and EN60959.

BABT CR/T/0053.

•

Fully encapsulated in epoxy

for mechanical protection

and to insure the dielectric

strength requirements.

TEW4923

AMD

79C30A

“

National

TP3420

”

Siemens PEB2080

“

Siemens PEB2081

”

Siemens PEB2085

“

Siemens PEB2086

TEW4923 - 1

Intel

29C53

TEW4923 - 2

Mitel

MT8930A

“

Mitel

MT8930B

”

Mitel

MT8931B

TEW4923 - 3

Motorola MC145474

Motorola MC145475

TEW4923 - 4

Motorola MC145574

Turns ratio

(1 - 3) : (6 - 4)

2 : 1

1.8 : 1

2 : 1

1 : 1

2.5 : 1

DCR

(Ohms)

(1 - 3)

5.4

6.7

8.4

3.7

12.8

(6 - 4)

2.7

3.2

3.7

3.2

3.2

Inductance

(mH)

(6 - 4)

> 22

> 22

> 22

> 22

> 22

Leakage Ind.

(µH)

(6 - 4)

< 6.0

< 6.0

< 12

< 6.0

< 12

L..C.L.

(dB)

10 - 300 KHz

> 54

> 54

> 54

> 54

> 54

Output/Input Impedance

Conforms to the impedance mask given in CCITT I.430.

Pulse Shape

Conforms to the pulse mask given in CCITT I.430 with

50 and 400 ohms terminations.

Dielectric Strength

(Volts rms)

4000

4000

4000

4000

4000

TEW4923, -1 and -3

WHITE DOT

AT PIN 1

6

5

4

ISDN S-Bus

Input/Output Transformer

TEW4923

1

2

3

MECHANICAL

ELECTRICAL

TEW4923

TEW4923-1

TEW4923-2

TEW4923-3

TEW4923-4

TEW4923-2

6

5

4

1

3

MT8930A/B

Connection of TEW4923-2

4

5

6

1

3

3

1

6

5

4

Filtran Limited

229 Colonnade Road, Nepean, Ontario, Canada, K2E 7K3,

3-8

Tel: (613) 226-1626, Fax: (613) 226-7124