Allied Telesis AT-MR908TX - Manual (Page 32)

Installation
12
Cascading With Fast Ethernet
Two AT-MR908TX hubs can be cascaded to enable support for up to a
maximum of 14 network port connections.
The Two-Repeater Rule. Because of the Two Repeater Rule for IEEE 802.3u,
the maximum number of Class II hubs allowed in a cascaded configuration is
two. That is, the IEEE 802.3u standard provides general rules for 100BASE-
TX cable length and network connections on single segments of cable or on
point-to-point links with media attenuation and signal propagation delays.
The basic rule is that, in a Class II installation, each hub in the network is
viewed as a standalone hub and, therefore, the maximum number of hubs in
the data path between any two nodes cannot exceed two.
Cascaded Installation. You do not need to upgrade a standalone AT-MR908TX
hub to enable cascading. Connection is established between Port 1 on the first
hub and any port (2 through 8) on a second AT-MR908TX hub.
Figure 7 shows two AT-MR908TX hubs installed in a cascaded hub
configuration.
Figure 7: Cascaded Hubs
Port 2
(hub B)
Port 1
(hub A)
MDI/MDI-X
switch set
to MDI