AT-3624TR/3648TR Installation Manual - Allied Telesis

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IEEE 802.3/ETHERNET 10BASE2
MULTIPORT HUB/REPEATER
with Network Management
IEEE 802.3/ETHERNET 10BASE2
8 PORT HUB/REPEATER
with Network Management
IEEE 802.3/ETHERNET 10BASE2
8 PORT HUB/REPEATER
with Network Management
AT-3608 Connectivity
FOIRL NETWORK PORTS 1-8
RS-232
TERMINAL PORT
STATUS
POWER
1 2 3 4 5 6 7 8
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
CentreCOM 3608
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
APPLIQUÉ PORT
N LINE
NORMAL/CASCADE
8
ON LINE
ON
Normal
or
cascade
port
switch
F
ATOR
CEIVE
OFF
TERMINATOR
RECEIVE
Figure 30: Normal/Cascade
Port
Port 8 can be used as either a normal port or a cascading port. To be used
as a normal port, Port 8 must be grounded at either the repeater or at the
DTE, as recommended by IEEE specifications. Grounding is necessary
because Port 8 is NOT tied to chassis ground. This means that ground
loops are possible unless there is a connection to a port that has a chassis
ground. In this case, Ports 1 through 7 all have chassis grounds.
Cascading through Port 8 of a single, standalone AT-3608 hub to a second
AT-3608 hub effectively enables the network to consist of 14 nodes.
If you use Port 8 to cascade hubs, therefore, you should connect the other
end of the link segment to Port 1 of the second hub, as shown in Figure 31.
Port 8
10 BASE 2 NETWORK PORTS 1-8
NORMAL /CASCADE
RS-232
TERMINAL PORT
STATUS
POWER
1 2 3 4 5 6 7 8
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
AUI
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
APPLIQUÉ PORT
10 BASE 2 NETWORK PORTS 1-8
NORMAL /CASCADE
RS-232
TERMINAL PORT
STATUS
POWER
1 2 3 4 5 6 7 8
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
ON LINE
AUI
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
RECEIVE
APPLIQUÉ PORT
Figure 31: AT-3608 Cascade
Connection
Port 1
Note, however, that no more than four AT-3608 hubs (with twenty-six
ports) can be included in a single segment of cable. That is, it cannot
violate the four-repeater rule.
The Four Repeater Rule. The IEEE 802.3 standard provides general
rules for 10BASE-T 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 the maximum number of hubs/
repeaters in the data path between any two nodes is four.
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