Make sure there are no double lines or branches punched
down together. The system may work for a while, but the
non-connected branch will act like an antenna (picking up
unwanted noise) and slow down the network. Eliminate any
branches.
Installing New Twisted Pair Wire
If the existing wire in your building(s) does not meet IEEE
802.3 specifications, you may want to install new wiring. If
you have a noisy (electrical noise) environment, you may
select shielded twisted pair wire. If shielded twisted pair
wire is used, the shield may be connected to chassis ground
through the shielded modular RJ-45 Amp connector (see
page 3).
Wiring Specifications
Twisted Pair Media
The cabling between nodes on the network must be twisted
pair cable. Shielded twisted pair is also available. The
physical characteristics must meet or exceed those set forth
by the IEEE 802.3 10BaseT specifications. Generally, Level
4 wire or better is recommended. The cable must have a
minimum of 2 pairs of twisted 22-26 AWG wire. “Flat or
Straight” wire is not recommended.
-Gauge
22 to 26 AWG
-Attenuation
Less than 11.5 dB
between 5 and 10 MHz
-Differential Characteristic
85 to 110
Ω
@ 10 MHz
Impedance
-Maximum Distance
100 Meters (330 Feet)*
Cascading Hubs
Ethernet hubs may be cascaded together to support larger
networks. When cascading the 24 port hub to another
Ethernet hub, a crossover cable is required (See page 9 for
pinning instructions). Also, when cascading via the optional
Slide In Card (E-TBT-SIC), or cascading through trans-
ceivers connected to AUI ports, a crossover cable is
required. Note: Do not cascade hubs via AUI ports with an
AUI cable.
FIG 3: SIC CARD INSTALLATION VIEW
Slide in Card Indicator Lights
E-CX-SIC
Power indication only
E-FRL-SIC
Power and Link indication
E-TBT-SIC
Power and Link indication
The Slide In Cards are installed in the rear of the hub and
can only be installed one way. If seated properly, the power
indicator LED will light. When Link has been established,
the Link LED will light on the E-FRL-SIC and E-TBT-SIC
cards. See Figure 3 below:
