Contemporary Control Systems QuickLink Active Hubs - Manual (Page 3)

Each transformer comes with a 6 -foot cord molded into the transformer. The
other end is stripped and tinned and must be secured to the two-position
removable connector located on the QL. With power removed from the
transformer, attach one wire to one of the terminals and the other wire to the
remaining terminal. Polarity of the wires is of no concern. Once wired,
plug the transformer into the appropriate wall socket to power up the QL.
Figure 1 — The QL can be powered by an external low-voltage transformer.
Figure 2 — The QL must have its companion transformer secondary
leads attached to its two-position removable connector.
The QL supports two transceiver types which are described below:
-CXS Coaxial Star
Typically, ARCNET is cabled with RG-62/u coaxial cable (with BNC
connectors) in a star topology. Each network interface module (NIM)
connects directly to a port on the QL hub. The coaxial star configuration
provides the longest coaxial distance and simplified troubleshooting. A
-CXS port effectively terminates the end of a coaxial bus segment without
the need of a passive terminator. With this configuration, the bus segment
can support up to eight NIMs with a maximum segment length of 1000 feet
(305 m).
-TPS Twisted-Pair Star
Unshielded or shielded twisted-pair wiring such as IBM Type 3 (#24 or #22
AWG solid copper twisted-pair cable or telephone wiring) can be used.
External BALUNs are not required since CC’s twisted-pair NIMs and hubs
have internal BALUNs. Twisted-pair is convenient to install; however, its
attenuation exceeds coaxial, its noise immunity is less, and its maximum
length between a node and a hub is lower. RJ-11 connectors are used with
this cable. A -TPS port effectively terminates the end of a twisted-pair bus
segment without the need of a passive terminator. With this configuration,
the bus segment can support up to eight NIMs with a maximum segment
length of 330 feet (100 m).
TD990300-0I
H
3