T1/CEPT/ISDN-PRI TRANSFORMER
Quad Port SMT Transformer Module with
IC Side Protection
1. Flammability — Materials used in the products are recognized
as UL94-VO approved. Products meet the requirements of
IEC 695-2-2 (Needle Flame Test).
2. Balance Characteristics — The transformers meet the require-
ments for longitudinal balance of FCC part 68.
3. Common Mode Rejection Ratio — the CMRR for all transformers
is better than 50 dB at 1 MHz. A typical test circuit is shown below.
4. Crosstalk Attenuation — In the dual packages, which contain
transmit and receive transformers side by side, sufficient crosstalk
attenuation is achieved by the inherent characteristics of the toroid
cores as well as by their proper positioning. The crosstalk attenua-
tion is typically 50 dB or better from 100 kHz to 10 MHz. This
result was established with the test circuit shown below.
5. Return Loss — ITU-T G.703 and European national regulatory
documents specify minimum return loss levels. The transformers
will allow these limits to be complied within the situations where
they are applicable.
Frequency 50-100 kHz 100 kHz-2 MHz 2-3 MHz
Return Loss
XMIT 9 dB 15 dB 11 dB
REC 12 dB 18 dB 14 dB
6. Surge Voltage Capability – All transformers and chokes
meet surge voltage tests according to the most stringent
regulatory documents when system designs include the proper
voltage and current suppression devices.
7. Isolation Voltage — 100% of transformers are tested during
production to the specified isolation voltage level.
8. General Information — The TX9027 is specifically designed for
use in 1.544 Mbps (T1), 2.048 Mbps (CEPT) and ISDN Primary
rate (PRI) interface applications. Use of the proper transformer
allows the interface circuit to comply with ITU-T G.703 and other
standards regarding pulse waveform, return loss, and balance.
Application Notes
UNITED STATES
(Worldwide)
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U.S.A.
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FAX: 858 674 8262
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FRANCE
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Orgelet
France
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TAIWAN, R.O.C.
(Northern Asia)
3F-4, No. 81, Sec. 1
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Hsi-Chih, Taipei Hsien
Taiwan, R.O.C.
Tel: 886 2 2698 0228
FAX: 886 2 2698 0948
SINGAPORE
(Southern Asia)
150 Kampong Ampat
#07-01/02
KA Centre
Singapore 368324
TEL: 65 6287 8998
FAX: 65 6280 0080
HONG KONG
(China/Hong Kong)
9/F, Phase 2, Tai Sang
Shatin Warehouse Centre
6 Wong Chuk Yeung Street
Fotan, Shatin, Hong Kong
TEL: 852 2788 6588
FAX: 852 2776 1055
DISTRIBUTOR
T691.A (8/04)
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Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
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