Aastra OpenCom X320 User Guide - Page 135
Connection via an Active Transmission System, 10.2.3 Connection via the Public Network
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PBX Networking PBX 1, S0 ext 12345678 Types of Point-to-Point Connections 87654321 PBX 2, S0 ext (RJ-45 socket) Wiring of a direct connection Note: If you use an S0 port on an interface card (pressure terminal) and an S0 port with an RJ45 jack for the direct connection, make sure you make the necessary changes to the port assignment (see S0 ports starting on page 41). 10.2.2 Connection via an Active Transmission System For distances exceeding the range of a direct connection, an active transmission system can increase the range to up to 50 km. Normally the L1 master is the transmission system for the two connected PBXs. For the protocol layers L2 and L3, one PBX is normally the protocol master and the other PBX is the protocol slave. PBX 1 L1 slave L2 master L3 master Transmission System L1 master PBX 2 L1 slave L2 slave L3 slave Connection by an active transmission system Note: The active transmission system itself gets its L1 clock either from the network operator or from a clock generator connected by wire. 10.2.3 Connection via the Public Network Point-to-point connections via the public network of a network operator can be used for bridging distances beyond 50 km. Due to the long distance involved, for technical reasons it is not possible to synchronise the L2 protocol. Consequently, the public network is normally the protocol master for protocol layers L1 and L2. One PBX is therefore the L3 master and the other PBX the L3 slave. 133