A TP1 line consists out of maximum 4 TP1 segments.

In case more than one segment is required:

- one line repeater per extra segment is required
- one TP1 choke per extra 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.

**TP1-64 vs. TP1-256 devices**

Since November 2017 also TP1-256 devices can be used within a TP1 segment, i.e. if a TP1 segment consists out of TP1-256 devices then **no repeaters** are required in order to reach the maximum capacity of a line.

Example 1 - only use TP1-64 devices:

To set up such a full ranged TP1 line, 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 such a TP1 line to: (4 x 64) - 6 = 250 devices.

Example 2 - only use TP1-256 devices:

To set up such a full ranged TP1 line, only one TP1 line is required.

Maximum capacity: segment 1

No capacity is taken by TP1/TP1 couplers.

This brings the maximum capacity of such a TP1 line to: 256 devices.