IEEE 820-2005 pdf download IEEE Standard Telephone Loop Performance Characteristics
1. Overview
1.1 Scope
This standard covers the general parameters and characteristics associated with telephone loops from thesubscriber signaling and analog voice frequency interface to the local Class 5 switch interface. It includesonly those business and residential lines in the North American public switched network where no specialperformance requirements are involved.
This standard provides common denominators for subscriber line performance, independent of facilitytypes, construction processes or equipment, and circuit provisioning methods.
1.2 Purpose
The purpose of this standard is o describe quantitatively the performance characteristics of telephone loopsand indicate current acceptable performance criteria.
2.References
The following referenced documents are indispensable for the application of this document, For datedreferences,only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments or corrigenda) applies.
ANSI/TIA 470.210-C-2004,Telecommunications-Telephone Terminal Equipment-Resistance andmpedance Performance Requirements for Analog Telephones.
IEEE Std 661mIEEE Standard Method for Determining Objective Loudness Rating of TelephoneConnections.2,3
3. Definitions, acronyms, and abbreviations
3.1 Definitions
For the purposes of this standard, the following terms and definitions apply. The Authoritative Dictionary ofIEEE Standard Terms B14]” should be referenced for terms not defined in this clause.
3.1.1 analog switch: A switch capable of switching analog and digital signals without converting them intoa set digital format. Most analog end office switches are two-wire systems that have simple interfaces withthe loop.
3.1.2 battery feed: The dc supply and coupling circuit powering the loop.
3.1.3 bridged tap: Any portion of a metallic circuit which is not in the direct current (dc) path between theend office (or central office) and the customer network interface. A bridee tan occurs when a branching con.ductor is connected or spliced into a conductor of the main cable. The bridged tap may be connected at anintermediate location or be an extension of the metallic circuit beyond the customer location. The pair asso-ciated with the bridged tap introduces a frequency-dependent bridging loss in the loop.
3.1.4 central office (CO): The building, one or more switching systems, and related equipment containedtherein that provide telephone service.
3.1.5 C-Notched filter: A filter used in front of the noise detector in conjunction with the measurement ofnoise in certain systems. A tone is transmitted in these systems to activate signa-dependent noise sourcesbut the tone power should not be included in the measurement The C-Notched filter has a C-Messageweighting transfer function with a sharp notch, which removes this tone from the received signal before itspower is measured.
3.1.6 customer premises equipment: Any equipment connected by customer premises wiring to the cus-tomer side of the network interface
3.1.7 digital switch: A switch that, internally, performs switching only of digital signals of a set format. lt isinherently a four-wire entity, requiring a two-wire to four-wire hybrid at the channel interface when accepting analog signals from two-wire channels.
3.1.8 dual-tone multifrequency (DTMF) signaling: Voiceband signaling by simultaneous transmission oftwo tones, one from a low-frequency group and one from a high-frequency group. Each of these groups con-sists of four voiceband frequency tones. no two of which are harmonically related.
IEEE 820-2005 pdf download
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