Nortel Meridian 1 Planning And Installation Manual page 396

Appendix A – General information for the United Kingdom Page 375 of 590
Note 1: Calculate the port-to-port call path loss by finding the
intersection of the input port (row) and the outport port (column) for that
direction of transmission. In some cases, the loss is different for the two
directions of transmission.
Note 2: One of the "ports" listed above is a digital or Rapport telephone.
The value found by the referencing process described above is a loudness
rating instead of a loss.
Note 3: In Table 71, a positive figure indicates a loss, and a negative
figure indicates a gain.
Note 4: Connections between exchange lines are permitted if both lines
are digital. If not, PSTN to PSTN connections are blocked. In Table 71,
an "X" indicates blocked connections. For more information, refer to
Oftel General Variations NS/V/123/L/100010 and
NS/V/1235/P/100020.
Option 11C Mini Planning and Installation Guide