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BUSINESS TELECOMMUNICATIONS (BT) - TRANSMISSION CHARACTERISTICS AT 4-WIRE ANALOGUE INTERFACES OF A DIGITAL PRIVATE AUTOMATIC BRANCH EXCHANGE (PABX)
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Available format(s): Hardcopy, PDF
Withdrawn date: 22-07-2013
Language(s): English
Published date: 31-12-1991
Publisher: National Standards Authority of Ireland
1 Foreword2 Scope3 Related standards4 Definitions5 Four-wire interface specifications 5.1 Characteristics of interfaces 5.2 Characteristics of half connectionsAnnex A: Relative levels for M4 and K4 interfaces in dBrAnnex B: Impedance unbalance about earth in different European AdministrationsAnnex C: Single frequency noise (dBm0)Annex D: Discrimination against out-of-band signals applied to the input interface: Signals below 300 HzAnnex E: Nominal values for input impedance and return loss
Gives characteristics for: - 4-wire analogue interfaces (Type M4 and K4), - input and output connections with 4-wire analogue interfaces, and - half connections with 4-wire analogue interfaces.
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