Subnetwork Installation Guidelines
Network Guide 79
Cat 5e Cable Subnetwork Data Bus
The Cat 5e Cable subnetwork data bus is used to connect compatible room devices (Table 15)
to any Distech Controls ECB/ECL series controller. See Subnetwork Module Compatibility and
Supported Quantity Charts on page 71 for a list of compatible extension / expansion modules.
Cat 5e Cable Subnetwork Data Bus Cable Requirements
The Cat 5e Cable subnetwork data bus uses commonly available Cat 5e structural cabling fit-
ted with RJ 45 connectors. If you make your own patch cable, use Category 5e cable and
crimp the RJ 45 connectors at both ends of the cable either as T568A or T568B.
Never connect an IP (Ethernet) network to the SUBNET PORT connector of a con-
troller or RJ 45 connector of a room device. Equipment damage may result.
Table 17: Cat 5e Cable Subnetwork Data Bus Physical Specifications and Cable Requirements
Parameter Details
Maximum number of room devices See Subnetwork Module Compatibility and Supported Quan-
tity Charts on page 71. See also the controller’s datasheet.
Subnet ID Addressing Configuration See Setting the Subnet ID Addressing for Room Devices on
page 84.
Media Cat 5e Patch Cable with RJ-45 Connectors (standard
straight patch cable)
RJ-45 Pin Configuration Four (4) pairs required. Straight-through wiring. Crimp con-
nectors as per T568A or T568B (both cable ends must be
crimped the same way).
Characteristic impedance 100-130 Ohms
Distributed capacitance Less than 100 pF per meter (30 pF per foot)
Maximum total length of the Cat 5e
Cable subnetwork data bus plus the
2-Wire subnetwork data bus
300 m (1 000 ft.) Maximum – See Subnetwork Data Bus
Length on page 75.
Maximum length of the Cat 5e
Cable subnetwork data bus
180 m (600 ft.) Maximum – See Subnetwork Data Bus
Length on page 75.
Polarity Polarity sensitive
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