Johnson Controls Metasys Intelligent Fire Network Technical Manual page 27

The specifications for the MIB (MIBs and MIB-OWSs) are explained as
follows:
MIB-W
Table 9: MIB-W (Wire) Specifications
Medium Supported
Number of Data Thresholds Set by
Software
Transmission Rate
Wiring Style
Terminal Wiring
Bypass Relay
LED (Light-Emitting Diode)
Connects to Devices
Note: Transformer coupling provides electrical isolation between nodes, unless
bypassed by switch selection (SW1 for Port A and SW2 for Port B). Be sure that
ground fault detection is not enabled on two IFC panels for the same section of
wire. For details, see the Ground Fault Detection section of this technical
bulletin.
Interconnecting the MIB-W
When wiring consecutive MIB-W boards, wiring may enter or exit at
Port A or Port B as shown in Figure 5. MIB-W port-to-port wiring is not
polarity sensitive. The use of Port A or Port B is arbitrary.
Note: Wiring from the MIB-W that is situated outside the building:
• cannot exceed 100 m (3,000 ft)
• must be underground and in conduit
• cannot cross any power lines
• cannot be in the same conduit as power lines
Twisted Pair Wire
2
312.5K Baud
NFPA Style 4 (Class B)
NFPA Style 7 (Class A)
Pluggable with Strain Relief
Feeds signal directly to next node.
Indicates network activity on the port.
See Table 15 and Figure 27.
MIB-WF
RPT-W
RPT-WF
Another MIB-W
IFC Networking—Metasys Intelligent Fire Network 27