Digital Private Network Signalling System - Practical Considerations

Practical Considerations

As HDLC can operate successfully in quite poor (errored) data environments, DPNSS will work over a 2Mbs link running without proper synchonisation (plesiochronously) and over poor quality connections (including badly terminated connectors). When setting up PBXs to run a DPNSS connection one end must be defined as the primary or 'A' end. This is a protocol requirement and has nothing to do with link synchronisation. However, such badly synchronised links were frowned upon because of the problems associated with sending faxes and/or other modem based communication which were not specifically identified within the protocol.

Read more about this topic:  Digital Private Network Signalling System

Famous quotes containing the word practical:

    While there are practical and sometimes moral reasons for the decomposition of the family, it coincides neither with what most people in society say they desire nor, especially in the case of children, with their best interests.
    Robert Neelly Bellah (20th century)