MODEM MAGNETICS
V.90 Modem Transformer
TM00409
•
Provides isolation and balance while minimizing signal
distortion and insertion loss in high speed modem
applications
Designed to match a 600Ω line to a 360Ω load
•
Designed to provide supplementary insulation at a
working voltage of 250V
Approved by UL, CSA and BABT
Minimum interwinding breakdown voltage of 1500 Vrms
•
•
•
•
Qualified per Bellcore TR-TSY-000357-1
ELECTRICAL SPECIFICATIONS at 25° C
Insertion
Loss
dB
@ 1 kHz
Return Loss
dB
Frequency
Response
dB
100 Hz - 4 kHz
Pri
DCR
Ω
max
Sec
Harmonic
Distortion
dB
-3dBm, 150 Hz
Longitudinal
Balance
dB
200 Hz - 3500 Hz
Part
Number
Turns Ratio
± 2%
200 Hz - 3500 Hz
2811B
1:1
< 2.1
> 20
< 0.1
135
135
< -75
> 60
SCHEMATIC
2811B
1
6
3
Primary
4
Secondary
TYPICAL SPICE TRANSMISSION MODEL
6.2 mH
120
1
35 pF
3
120
6
120k
40 H
35 pF
4
©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
Bel Fuse Inc.
198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T4-19
MODEM MAGNETICS
TM00409
V.90 Modem Transformer
MECHANICAL
2811B
0.565
[14.35]
0.118 [3.00]
0.020 [0.508]
Sq. wire
0.300
[7.62]
1
0.500
[12.70]
6
3
0.710 [18.03]
max sq.
4
Note: Unless otherwise specified, dimensions
are nominal and in inches [millimeters].
©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
CORPORATE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
T4-20
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