Figure 1-9 Virtual Trunk - NEC Neax 2000 IVS2 Manual

CHAPTER 1 GENERAL INFORMATION
Outline of Event Based CCIS
For Event Based CCIS, the virtual trunks are used as a No. 7 CCIS trunk.
Virtual Trunk:
The virtual trunk consists of a Home-Side Trunk and a Mate-Side Trunk. The Home-Side
Trunk is connected to the station side, and the Mate-Side Trunk is connected to the network
side of the PBX virtually.
The virtual trunks do not exist actually, but are handled as a No. 7 CCIS trunk by the system,
for system data. ISDN subaddress or ISDN indial number is used to notify the CCIS channel
number for virtual tie line and establish a CCIS link and individual voice links between
offices.
LC/TRK
CCH Card:
The CCH card is used to handle the common channel signaling.
DTI/BRT/PRT Card:
The system uses the same interface trunk for regular ISDN connection and the virtual tie
line connection on Event Based CCIS.
ISDN Protocol Analyzer:
For ISDN PRI, the protocol analyzer must be able to support ISDN exchange, such as AT&T,
Nortel. For North America, it must support National ISDN 2 (NI-2) protocols.
For ISDN BRI, the protocol analyzer must be an S/T interface. For North America, it must
support National ISDN 1 (NI-1) protocol.
Both analyzers must be capable of collecting Layer 2 and Layer 3 (Q921 & Q931)
information.
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Figure 1-9 Virtual Trunk

TDSW
DTI/BRT/PRT ISDN
MATE-SIDE
VIRTUAL
TRUNK
HOME-SIDE
2
NEAX2000 IVS
ND-70919 (E), Issue 1.0
ISDN System Manual