On-Net Station to Analog Trunks
The diagram below specifies digital PBXs using analog Tie Trunks. The DPBXs use -2 TX and RX TLP (Transmission Level Point) values. ICL (Inserted Circuit Loss is not specified, but is provided so that a customer can optimize loss (e.g. VNL). End-to-End loss is 6 dB + ICL.