16
16- AND 24-PORT STACK HUBS
You can connect any combination of PCs, servers, and other single-address network
devices to the twisted-pair ports using straight-through twisted-pair cables. These
cables should not be crossed over. The following figure illustrates the pin
assignments for a straight-through cable:
Figure 5-2. Straight-through cable pinning.
When connecting a PC or a server, the system being connected should have an
Ethernet or Fast Ethernet network interface card with a twisted-pair port.
5.4 Hub-to-Hub Uplink
You can link two Hubs or Hub stacks to each other using the Uplink port. Linking
using one ordinary twisted-pair port and the Uplink port requires an ordinary
straight-through twisted-pair cable.
When connecting two hubs or hub stacks in this fashion, the maximum distance
between any two end-stations in a collision domain is 205 meters (673 ft.).
However, the true measure of whether your network will operate correctly in a
collision domain while using a mix of physical media and repeaters is the
bit time
delay
of the physical media and repeaters. If the bit time delay exceeds 512 bit times
in a collision domain, the network will not operate properly, regardless of the
physical distances. For assistance in designing your network to accommodate the
maximum diameter it can achieve under individual conditions, please contact
Black Box Technical Support at 724-746-5500.
Workstation (MDI)
Hub (MDI-X)
RD+ 1
RD-
2
TD+
3
TD-
6
1 TD+
2 TD-
3 RD+
6 RD-
