Nortel BCM 3.7, Manual

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846 BRI and PRI line types
N0008589 3.3
DPNSS (international term: Q.Sig or Q.931) a digital private network signaling system which allows
phone systems from different manufacturers to be tied together over E1 lines, offering
significant enhancements to Business Communications Manager networking capabilities.
DPNSS makes it easier to support centralized network functionality within private networks,
for operators and attendants dealing with large numbers of calls. Its routing capabilities
provide more of the larger-network capabilities without the expense of installing a new
system, re-configuring all the nodes and worrying about a lot of downtime. Most
functionality over DPNSS lines is transparent once the DPNSS is programmed into the
system.
DPNSS allows a local node, acting as a terminating node, to communicate with other PBXs
over the network using E1 lines. For example, corporate offices separated geographically
can be linked over DPNSS lines to other Business Communications Manager systems,
bypassing the restrictions of the PSTNs to which they may be connected. This allows
connected Business Communications Manager systems to function like a private network.
Analog trunk types
Public Provides potential access for any set on the system.
Private Provides potential access for a specific set.
Table 277 BRI and PRI line types (DTM and BRI modules) (Continued)
Digital trunk types Description