Philips SOPHO 2000 IPS User Manual page 37

For Event Based CCIS, the Virtual Trunks which 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 network side of the PBX
virtually.
The virtual trunks do not exist actually, but are handled as 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.
Virtual Trunk
TDSW
DTI/BRT/PRT
– 23 –
CHAPTER 1 GENERAL INFORMATION
OUTLINE OF EVENT BASED CCIS
ISDN
MATE-SIDE
VIRTUAL
TRUNK
HOME-SIDE
NWA-008852-001 Rev.5.0
98ch1001.fm