Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 81
5.5.3 Cabling
The information listed below applies when connecting the
VDH2(8)-U( ) ETU.
Normally the 10Base-T cables connected to the
VDH2(8)-U( ) ETU cannot be directly connected to
another HUB or to a LAN terminal. A set of jumpers
is provided on the VDH2(8)-U( ) to turn off the
station abilities for ports 1~7. In this case LAN
terminals can be connected directly to the
VDH2(8)-U( ) ETU. Refer to Figure 5-46
VDH2(8)-U( ) ETU Jumpers for the layout of
jumpers on the KTU.
Port 8 is unique because the station abilities cannot
be separated by changing a jumper setting like
ports 1~7. Port 8 is to be used for cascading HUBs.
Connect Port 8 either to another VDH2(8)-U( ) (Port
1~7) or an external HUB. In this case be sure to set
SW2 on the VDH2(8)-U( ) to =. If SW2 is set to X,
then Port 8 is used as a regular coreline connection.
Refer to Figure 5-47 10Base-T Cable Connections.
The VDH2(8)-U( ) ETU can be used with 10Base-2
and 10Base-T cables. VDH2(8)-U( ) ETU HUBs can
be cascaded using 10Base2 cables. The 10Base2
connector can also be used to connect the
VDH2(8)-U( ) ETU to a LAN backbone. (Refer to
Figure 5-48 VDH2(8)-U( ) ETU.) In this case, the 8
port is still used for coreline. The 10Base2 cable
interconnecting VDH2(8)-U( ) ETUs must be greater
than 0.5 meters. Care should be taken so the
10Base2 cables are neatly coiled. When the
10Base2 cables are connected to the VDH2(8)-U( )
BNC connector, a terminating plug must be used if
this is the last device on the cable. Refer to Figure
5-49 VDH2(8)-U( ) ETU Connections.
The preferred method of cascading VDH2(8)-U( )
ETU hubs is using the 10Base-2 cables because it
does not reduce the quantity of station ports that the
ETU can provide.