Figure 5-1. Typical 2-Level Hierarchical Electronic Tandem Network (Etn Configuration - AT&T DEFINITY 2500 series Network Manual

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MAIN
TANDEM SWITCH
BYPASS
ACCESS
TIE TRUNK
MAIN
TIE
SATELLITE
TRUNKS
Figure 5-1. Typical 2-Level Hierarchical Electronic Tandem Network (ETN) Configuration
ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES
UPPER LEVEL
FINAL
DIMENSION
PBX
OVERFLOW
FINAL
OVERFLOW
PRIMARY
SYSTEM 85
HIGH USAGE
TANDEM
SWITCH
LOWER LEVEL
ACCESS
TIE
MAIN
TRUNKS
TRIBUTARY
PRIVATE NETWORK
(ON-NET)
MAIN
SYSTEM 85
TANDEM
SWITCH
FINAL
INTERMEDIATE
HIGH USAGE
INTERMACHINE
TIE
TRUNKS
SYSTEM 85
TANDEM
SWITCH
MAIN
SATELLITE TRIBUTARY
5-3
SATELLITE
DDD
TRIBUTARY
WATS
FX
IXC
DDD
WATS
FX
IXC
DDD
WATS
FX
IXC
MAIN
PUBLIC NETWORK
(OFF-NET)