10Base-T (Rj-21) Module; 10Base-T (Rj-21) Configuration - 3Com CoreBuilder 2500 Getting Started Manual

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10BASE-T (RJ-21) Module

This section contains information on common
10BASE-T (RJ-21) configurations, how to cable the
10BASE-T (RJ-21) media option, and how to connect
the modules to the network using harmonica panels
and punch-down blocks.
Follow these guidelines when cabling 10BASE-T:
Use only copper, unshielded twisted-pair (UTP)
wire. Do not use flat, multiconductor cable (for
example, silver satin), which is often identified by
solid colors such as red, green, yellow, or black.
Use two twisted pairs for each link.
Use twisted-pair wire that is 22-26 AWG (0.5
millimeter) in diameter.
Use twisted-pair wire with an impedance
between 85 and 115 ohms.
Ensure that the twisted-pair link length from the
system to any potential workstation location is
100 meters (328 feet) or less.
10BASE-T (RJ-21) Configuration
A sample 10BASE-T (RJ-21) network configuration
is illustrated in Figure
have different quantities and types of devices than
pictured in this example.
4-1. Your configuration may
In Figure 4-1, an Ethernet module with one RJ-21
(10BASE-T) connector is connected to a harmonica
panel with a cable using a 50-pin Telco connector.
Attached to the harmonica panel's RJ-45
connectors are eight unshielded twisted-pair (UTP)
cables (a maximum of eight ports can be connected
for each 50-pin cable). These UTP links can be
attached to various devices.
following connected devices:
A server with an IEEE 802.3 Attachment Unit
Interface (AUI) and an IEEE 802.3 compatible
Ethernet transceiver attaching the UTP to the
AUI. The UTP connections on the transceiver use
RJ-45 connectors.
A workstation that conforms to IEEE 802.3, Type
10BASE-T specification, attached directly to the
UTP link. The UTP connections on these devices
typically use RJ-45 connectors.
A non-10BASE-T, proprietary UTP hub. Here, a
transceiver couples the standard AUI interface of
the hub to the UTP cable.
®
A NETBuilder II router
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A SuperStack II stackable hub
A coaxial cabling segment attached to the UTP
link by an IEEE 802.3 compatible repeater.
Network segments that use thinnet must
conform to the IEEE 802.3 Type 10BASE-2
specification.
Figure 4-1 includes the