The hubs use ordinary Category 5 twisted-pair cable with RJ-45 connectors
on each end for stacking. All four pairs of the eight-wire cable are used. A
30cm daisy-chain cable is included with the hub; this information is included
in case you want to make your own, longer cable.
Daisy-chain cables may be of any length, provided the distance between the
first hub and the last hub in the stack is 100 meters or less.
Pins 1/2, 3/6, 4/5, and 7/8 must be pairs,
splitting the cable will most likely cause errors.
RS-232 (DB9) Pin Specification
The RS-232 serial port of the hub uses a 9-pin female connector. The port
can be connected to a VT-100 type terminal, a PC, or a workstation
emulating a VT-100 terminal. The connection can be either local, or remote
through a modem. For a remote connection, a modem cable with a 9-pin
male connector on the hub side is needed. The figures below show the
connections necessary for local and remote connection to 9-pin and 25-pin
Cables and Connectors
10BASE-T Stackable Hubs