Aastra OpenCom 131 User Guide - Page 50
Port Assignment, Termination, Cable Lengths, 3.10.1 S0 Ports, Ports: 4 x a/b
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Installation Port Assignment, Termination, Cable Lengths Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b 2/1 2/2 2/3 2/4 3/1 3/2 3/3 3/4 4/1 4/2 4/3 4/4 5/1 5/2 5/3 5/4 -- -- -- -- Ports: 4 x a/b Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b 2/1 2/2 2/3 2/4 3/1 3/2 3/3 3/4 4/1 4/2 4/3 4/4 5/1 5/2 5/3 5/4 a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b a/b 2/5 2/6 2/7 2/8 3/5 3/6 3/7 3/8 4/5 4/6 4/7 4/8 5/5 5/6 5/7 5/8 -- -- -- -- Ports: 8 x a/b Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 - - a/b a/b 3/1 3/2 - - a/b a/b 4/1 4/2 - - a/b a/b 5/1 5/2 a/b a/b 3/3 3/4 a/b a/b 4/3 4/4 M100-AT4 Interface Card (4 analogue trunk lines) a/b a/b 5/3 5/4 3.10 Port Assignment, Termination, Cable Lengths 3.10.1 S0 Ports Whether you use the switchable S0 ports for internal or external communication depends on your communications requirements and the existing basic accesses. Note that the S0 bus requires a terminating resistor of 100 ohms at each end. 48