A TP1 line consists out of maximum 4 TP1 segments, the exact number of segments and the maximum number of devices per segment depends on the proportion of TP1-64 and TP1-256 devices:
- only TP1-256 devices: a line = 1 segment of maximum 256 devices
- only TP1-64 devices: a line = 4 segments of maximum 64 devices per segment
- mixture: the number of segments and the maximum number of devices per segment depends on the proportion of TP1-256 device and TP1-64 devices.
In case more than one segment is required, one line repeater per extra segment is required + one TP1 choke per segment is required.
Couplers vs. (regular) devices: In order the calculate the line capacity for devices, the capacity taken by couplers and repeaters needs to be taken into account.
To set up a full ranged TP1 line with only TP1-64 devices, its first TP1 line segment need to be connected to 3 additional TP1 line segments. The 3 additional TP1 line segments are connected to the first TP1 line segment via 3 TP1/TP1 couplers. The primary side of all 3 TP1/TP1 couplers need to be connected to the first TP1 line segment. This mean that the 3 additional TP1 line segments are put in parallel, it is not allowed to put them in cascade.
Maximum capacity: segment 1 + segment 2 + segment 3 + segment 4
The capacity taken by the 3 TP1/TP1 couplers from the line (primary side + secondary side) is 3 * 2 = 6 devices.
This brings the maximum capacity of a TP1 line to: (4 x 64) - 6 = 250 devices.