Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2002-12-27
2004-04-13
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S02800T, C333S08100R
Reexamination Certificate
active
06720841
ABSTRACT:
I. BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains to telecommunications components for use in telecommunications systems such as cable television networks.
2. Description of the Prior Art
In the telecommunications industry and more particularly in the video transmission industry (e.g., the cable television environment), broad-band radio frequency (RF) signals (i.e., 5 MHz to 1 GHz) are carried over coax conductors from a headend to consumers. At the headend of the system, numerous signals are manipulated to achieve a wide variety of functions and objectives. For example, signals carried on numerous coax cables may be combined onto a single coax conductor. Similarly, a signal on a main coax conductor may be divided into a plurality of signals carried on branch coax conductors. Additionally, signals may be added or removed from a main conductor through directional couplers or the like.
In addition to combining, splitting, diverting or adding signals, the headend will also include apparatus for modifying signals. For example, in order to adequately tune the system, it may be desirable to provide attenuators or the like to attenuate a signal to a desired level. Further, as a broadband RF signal is carried over a length of cable, the high frequency range of the signal may be attenuated more than a low frequency range of the signal. As a result, equalizers are utilized to modify the signal to have a level intensity throughout its frequency range.
Frequently, tuning is accomplished through the use of plug-in devices (e.g., attenuators or equalizers). Exemplary systems including plug-in devices are disclosed in U.S. Pat. No. 5,955,930, which is hereby incorporated by reference.
Currently the cable television environment uses plug-in devices that break the signal paths while changing out the plug-in devices. However, with the new opportunities that are present in the cable television environment (e.g., telephony, data and 911 service), it is important to prevent signal paths from being broken. Thus, what are needed are plug-in devices for the cable television industry that prevent signal paths from being broken when plug-in devices are changed out.
II. SUMMARY OF THE INVENTION
One aspect of the present invention relates to a telecommunications apparatus for use with a plug having at least first, second and third pins. The telecommunications apparatus includes a plug connector for receiving the plug. The plug connector includes at least first, second and third electrical contacts for electrically contacting the first, second and third pins, respectively, when the plug is inserted in the plug connector. The plug connector also includes an electrical by-pass pathway that: i) electrically connects the first and second electrical contacts when the plug is fully removed from the plug connector such that a signal can enter the plug connector through the first contact, pass through the by-pass pathway to the second contact, and exit the plug connector through the second contact; and ii) does not electrically connect the first and second electrical contacts when the plug is fully inserted within the plug connector such that a signal can enter the plug connector through the first contact, pass through the plug to the second contact, and exit the plug connector through the second contact.
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Communication Associates, JXP Short Orange 75 Ohm 1200 MHz (0.45”), web page, 4 pages (Apr. 9, 2002).
RF Products list for Communication Associates product No. CA007520 at www.communicationassociates.com.
Bluband Zakhary
Loeffelholz Todd A.
Manderfield Sara
McClellan Terry E.
Peterson Par G.
ADC Telecommunications Inc.
Merchant & Gould P.C.
Pascal Robert
Takaoka Dean
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