Page 1780 of 1814 Engineering and configuration guidelines553-2901-301 Standard 9.00 January 2002Note 1: The loss is bidirectional. For example, the A/TT coordinateindicates a nominal port-to-port loss of:0 dB from the A/TT interface to the Primary Rate Interface (PRI)3 dB loss from the Primary Rate Interface (PRI) to the A/TT interfaceNote 2: The table column is shown; the loss table has a correspondingrow.Note 3: For echo control reasons, this connection cannot be loss-less.Note 4: The value of 0 dB in the PRI-D/CO direction is the long-termobjective. The value of 3 dB is to be used for connections to D/COs thathave not been programmed for inserting receive-side loss on PRI to localloop connections.Legend:ONS Line interface/on premise lineOPS Line interface/off premise lineD/ONS Digital line interface/on premise lineI/ONS ISDN terminal (on premise)A/TT Analog trunk interface/analog TIE trunkS/ATT Analog trunk interface/analog satellite PBX TIE trunkA/CO Analog trunk interface/analog CO trunkA/TO Analog trunk interface/analog toll office trunkD/TT Digital trunk interface/digital or combination TIE trunkS/DTT Digital trunk interface/digital satellite PBX TIE trunkD/CO Digital trunk interface/digital or combination CO trunkD/TO Digital trunk interface/digital or combination toll office trunkPRI Primary Rate InterfaceCall connection limitationsCall connection restrictions limit user access to networks and features byallowing users to set the following limits:• number of tandem connections• number of call redirections• number of PSTNs; can be one or unlimited
