AT&T DEFINITY 7200 series - Manual (Page 107)

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