Allied Telesis AT-MR820TR - Manual (Page 42)

Connectivity
20
Twisted Pair (RJ45) Connector
Figure 11 shows a twisted pair cable with RJ45 connectors. For a
10Base-T link between a repeater and a Medium Attachment Unit
(MAU) or Network Interface Controller (NIC), the cable is wired
straight through.
Figure 11: RJ45 Connector
10Base-T STP cables can be up to 100 meters (328 ft.) in length. The
cable should be 22 to 26 AWG TP wire with 100
Ω
impedance and rated
at Category 3, 4, or 5. The AT-MR420TR/AT-MR820TR Micro
Repeaters use RJ45 modular connectors for 10Base-T connections.
10Base-T Cable. The AT-MR420TR/AT-MR820TR Micro Repeaters
support full-length, fully repeated transmission and maximum node
attachments which, for the STP/UTP link, enables transmissions to
100 meters (328 ft.).
A serious problem exists concerning identification of modular cable.
There are various grades of voice-quality and data-quality cables
available. These can appear to be similar, but their high-speed data
transmission characteristics are significantly different. Some suppliers
have sold purportedly data-quality cables manufactured with voice-
quality cabling.
If any voice-quality cabling is used in a 10Base-T network system, data
movement is slow, collision-prone or non-existent. To confuse the issue,
the Link indicator on the interface usually indicates a valid link.
MRx20TR(STP/UTP)_BookA Page 20 Thursday, April 3, 1997 5:24 PM