Combination conventional telephony and high-bit-rate digital channel transmission system comprising high pass filters which comprise both first order and second order high pass filters

US5982785A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Achim Woerner · Kleinmachnow, DE
• Dirk Schmuecking · Munich, DE

Key dates

• Filing date: Dec 3, 1996
• Grant date: Nov 9, 1999
• Expiry date: Dec 3, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M11/062
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The symmetrical Cu double lead line is asymmetrically terminated by two digital signal high-pass filters, one thereof at the exchange side being formed with a high-pass filter of the 4th order and the other thereof at the subscriber side being formed with a high-pass filter of the 1st order having a limit frequency of about 0.1.multidot.f.sub.Baud and a high-pass filter of the 2nd order. A high-pass of the 2nd or, respectively, 4th order has a limit frequency of about 100 kHz or with a limit frequency of about 30 kHz given employment of a separate 16 kHz band-stop filter.