• When powering remote units or switching power through relay contacts, power for these circuits must be provided by a power-limited power
supply that listed for fire-protective signaling use. An EOL relay must be used to supervise the auxiliary power circuit.
• Auxiliary power only: Supervision must be provided if the auxiliary power circuit is to be wired as a power-limited circuit. In order to connect a
circuit using power-limited wiring, the devices being powered must all be addressable, or a UL Listed EOL relay must be used to supervise the
circuit. Refer to the figure below for wiring directions for the EOL relay.
Figure 18: EOL relay
NIC wiring guidelines
• Network nodes must be wired right to left port, regardless of the media type selected.
• Class X protection is achieved by wiring the nodes in a loop fashion. A single fault (except an Earth fault) will cause the network to reconfigure
for degraded Class X and Class B operation. A second fault (except an Earth fault) will result in the network dividing into two separate networks.
• Class B is achieved by wiring the nodes in a linear fashion. Class B networks are not fault-tolerant and a single fault (except an Earth fault) will
result in the network dividing into two separate networks.
• Earth fault detection is performed on the left port only. When a network Earth fault occurs, the trouble is only reported on the node whose left
port is connected to the span.
• All 18 AWG wiring used with 4100-6056 Wired Media Cards must be twisted shielded pair. All 24 AWG (telephone cable) used with 4100-6056
must be twisted pair. When shielded cable is used, the shield must be terminated to chassis Earth on the left port only.
• It is permissible to use mixed media in a network. For example, some spans may be “wired media” while others are optical fiber or telephone
modem.
• Each NIC has a jumper for selecting between network data rates of 57.6 kbps and 9.6kbps. All cards in the network must be set for the same
rate. (When modem media or physical bridging is used, the data rate must be set for 9.6 kbps).
• Each NIC has a jumper for selecting between 8-bit and 9-bit network protocols. All cards in the network must be set for the same network
protocol. (When modem media or physical bridging is used, the protocol must be set for 8-bit).
• All network wiring except the shield is supervised.
• When wiring leaves the building, 2081-9044 Overvoltage Protectors are required. One overvoltage protector is installed where wiring leaves
the building; another is installed where wiring enters the next building.
• Transient Suppressor 748-599 is required for each modem-to-telephone line connection.
page 18 579-182 Rev. V
4100/4120-6014, 4100-6078 NICs and 4100/4120-Series Media Modules Installation Instruction
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