Aastra OpenCom 131 User Guide - Page 156
Connections, 12.1.1 Protocol: Q.SIG or DSS1, IP network connections Q.SIG-IP
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PBX Networking Connections 12.1 Connections Networking two or more TK systems means interconnecting them. The OpenCom 100 allows you to use the following connections: ■ ISDN trunk lines ■ ISDN point-to-point connections (Q.SIG) on external S0 ports or on the S2M port ■ IP network connections (Q.SIG-IP) PBX PBX PBX PBX Trunk line PBX Point-to-point connection Example of a PBX network Various line types and transmission protocols can be used for point-to-point connections. The required network topology (distance, connection capacity) determines which type of point-to-point connection is most suitable. 12.1.1 Protocol: Q.SIG or DSS1 The Q.SIG protocol, designed for ISDN point-to-point connections, is the preferable choice as the transmission protocol; alternatively, the DSS1 protocol, designed for ISDN dial-up connections in the Euro-ISDN, can be used. Certain PBX networking features can only be used with the Q.SIG/Q.SIG-IP protocol, however. In particular, the identifier indicating whether a call is internal or external cannot be transmitted using DSS1. Both protocols implement communication on several protocol layers: ■ L1: Layer 1 defines the physical line properties and the electrical coding of signals. ■ L2: Layer 2 enables communication via individual error-protected channels that are independent of each other. ■ L3: Layer 3 defines the administration of the individual channels and implements the features designed for ISDN. 154