NCR 7448 Hardware User's Manual page 24

1-8 Chapter 1: Product Overview
Note: Due to limitations of the LAN controller and the OS, all features
described in the Network Device Class Specification may not be available.
100 Base-T is wired identically to 10 Base-T, except that the twisted pair cable
must be Category 5 and the hubs must permit 100 or 10/100 Mb/s operation.
Although 10 Base-T will operate on Category 3 twisted pair, or NCR"747"
cable, an upgrade to Category 5 is required for 100 Base-T.
A customer desiring to use the workstation in an existing 10 Base-T
environment can do so, and simply run at 10 Mb. In order to upgrade to 100
Mb/s, Category 5 cable and 100 or 10/100 hubs must be installed. It is strongly
recommended that Category 5 be used for all new cabling, even if the customer
initially intends to run only 10 Base-T.
LED Indicators for Link Integrity (verifies cable and hub connection are good)
and LAN speed is provided on the processor board near the row of connectors at
the bottom of the e-box. The LED is ON (yellow) when the speed is running at
100 Mb/s.
Link Integrity is provided to the PC chipset to permit boot-up software to verify
the presence of the LAN connection. Software must allow two seconds after
power-up in order for the Link Integrity signal to become valid.