Table of Contents
1General
2Characteristicsofinterfaces
2.1Characteristicscommontoall4-wire
analogueinterfaces
2.1.1Exchangeimpedance
2.1.2Impedanceunbalanceaboutearth
2.1.3Relativelevels
2.2CharacteristicsofinterfaceC[11]
2.2.1Valuesofnominallevels
2.3CharacteristicsofinterfaceC[12]
2.3.1Valuesofnominallevels
2.4CharacteristicsofinterfaceC[13]
2.4.1Valuesofnominallevels
3Characteristicsofhalfconnections
3.1Characteristicscommontoall4-wireanalogue
interfaces
3.1.1Transmissionloss
3.1.2Groupdelay
3.1.3Noise
3.1.4Crosstalk
3.1.5Totaldistortionincludingquantizing
distortion
3.1.6Discriminationagainstout-of-band
signalsappliedtotheinputinterface
3.1.7Spuriousout-of-bandsignalsreceivedat
theoutputinterface
3.2CharacteristicsforinterfaceC[11]
3.2.1Nominalvalueoftransmissionloss
3.3CharacteristicsforinterfaceC[12]
3.3.1Nominalvalueoftransmissionloss
3.4CharacteristicsforinterfaceC[13]
3.4.1Nominalvalueoftransmissionloss Abstract
Gives characteristics for 4-wire analogue interfaces, input and output connections with 4-wire analogue interfaces and half-connection with 4-wire analogue interfaces in digital transit and combined local and transit exchanges in accordance with definitions given in Rec. Q.551. This publication covers switched connections that may be part of an international long-distance connection via 4-wire line circuits interconnected by 4-wire exchanges. As 4-wire analogue interfaces on digital exchanges may connect with circuits which are used for both international and national traffic, the same values that are applied for international connections can also be used for connections entirely within the national network.
