Ms/Tp Rj-45 Segment; Segment Length Calculation - Delta Controls DZNR-768 Installation Manual

MS/TP RJ-45 segment

Each of the four ports of the DZNR-768 has an RJ-45 jack that allows use of straight-through
unshielded twisted pair (UTP) Cat5 or higher (Cat5e, Cat6, etc.) cables.
For this type of wiring configuration, Delta provides the ADP45-MSTP accessory adapters that
allow you to split the segment, provide end-of-line loopback, convert between types of wiring
media and temporarily bypass missing or defective controllers.

Segment length calculation

The total length of a MS/TP RJ-45 network segment must not exceed 2000 ft (610 m). Segment
length is determined by the sum of all cable lengths, including runs between ADP45-MSTP
adapters, controllers and sensors. The following diagram provides an example of how MS/TP
RJ-45 segment length must be calculated.
DZNR
250 ft 50 ft
76.2 m 15.2 m
25 ft
7.6 m
CAT5 branch using
ADP45-MSTP-Y adapter
DZNR-768 Revision 1.2 Installation Guide
Document Edition 1.5
RJ-45 Segment Length Calculation
(2 x 50) + (8 x 25) + (4 x 100) + 250 + 300 + 700 = 1950
1950 ft < 2000 ft therefore segment length is acceptable
50 ft 100 ft
15.2 m 30.5 m
25 ft
7.6 m
700 ft
213.3 m
100 ft
30.5 m
25 ft 25 ft
7.6 m 7.6 m
100 ft
30.5 m
25 ft 25 ft
7.6 m 7.6 m
300 ft ADP45-MSTP-EOL
91.4 m End of Line
Loopback
25 ft
7.6 m
ADP45-MSTP-EOL
100 ft
End of Line
30.5 m
Loopback
25 ft
7.6 m
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