Telstra Commander i, Service Manual

Page: 28 / 195

Hardware Installation
Page 3-4
Example: the following connection diagram shows:
•
A system consisting of 5 stations and one AFU.
•
Wired as an extended star through a central MDF.
•
Master station number 1 is within 10 metres of the centre of the
star.
•
The end of all branches longer than 10 metres are terminated with
200 ohms.
•
Stations 4 and 5 are connected on the same branch of the star (only
end unit is terminated).
5 m
35 m
75 m
40 m
60 m
25 m
Master 1
Standard 3
Standard 5
Standard 7 Standard 8
Master 2 /
Standard 2
Standard 4
Standard 6
MDF
Commander i Configuration Diagram
Location:
AFU AFU
AFU 1
AFU 2
200
ohm
200
ohm
200
ohm
200
ohm
No
term
No
term
Master station number 1 located
within 60 metres of star centre
200 ohms on the end of every
branch longer than 10 metres
See Note 1
8
2 See Note 2
60
See Note 3
2
4
Master Station Number
1 Position
Termination
Max number of branches
Min number of branches
longer than 10 metres
Max branch length
Total sum of all branches
Max number of units per
branch
Max number of units
within 10 metres of star
- Maximum bus length: 200 metres.
- Terminations: 100 ohms at ends
of the bus only (2 terminations only).
- No more than four
keystations / AFUs within any 15
metre segment of cable.
- Master stations can be anywhere
on the bus.
Master station number 1 located
within 10 metres of star centre
200 ohms on the end of every
branch longer than 10 metres
See Note 1
9
2 See Note 2
150
Maximum 400 metres
2
4
Star Wiring Rules Extended Star
Bus Wiring Rules
Note 1: If two units are connected on a 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 the total length is 480 m (8 x 60 m = 480 metres)
Basic Star