Telstra Commander i, Service Manual, Page: 33 / 195

Hardware Installation
Commander i+ Product Service Manual - Issue 2 Page 3-9
Star Wiring Rules
Rules Basic Star Extended Star
Master Station Number 1
Position Master station
number 1 is located
within 60 metres of
the star centre. Master station
number 1 is located
within 10 metres of
the star centre.
Termination 200 ohms on the
end of every
branch longer than
10 metres.
See Note 1
200 ohms on the
end of every
branch longer than
10 metres.
See Note 1
Maximum number of
branches 8 9
Minimum number of
branches longer than 10
metres 2
See Note 2
2
See Note 2
Maximum branch length 60 150
Total sum of all branch
lengths See Note 3 Maximum 400
metres
Maximum number of units
per branch 2 2
Maximum number of units
within 10 metres of the
centre of the star. 4 4
Note 1 If two units are connected on the same branch then only the
end unit is terminated.
Note 2 There must be at least two branches longer than 10 metres.
Note 3 If there are 8 branches at 60 metres then the total length is
480 metres (8 x 60 metres = 480 metres).