Installation guide

MyPBX U520 Installation Guide
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When connected to the E1 line, RX- of E1 port should be connected to TX- of E1 line; RX+ of E1 port
should be connected to TX+ of E1 line; TX- of E1 port should be connected to RX- of E1 line; TX+ of E1
port should be connected to RX+ of E1 line.
For example, the line sequence o f the E1 line (RJ45 port) provided by the telecom company is: No.4 for
TX-, No.5 for TX+, No.7 for RX- and No.8 for RX+ which apparently can’t correspond to that of MyPBX
U520 E1 port. So you need jumper, which could be depicted as below:
Figure 3-1
Step 2: Connect the self-made RJ45 cables to E1 port.
Figure 3-2 Connection of E1/T1 port
2. Connection of FXO ports
The FXO port could be connected to the PSTN line or the FXS port of a traditional PBX with a phone line.
For instance, if No.2 and No.4 connectors are FXO ports, the connection could be depicted as below: