Siemens DataNET Hub (DNH) - Manual (Page 53)

2000585-001 Installation •••• 45
Ethernet Connections
The DNH consists of two identical hub modules in one enclosure. The
left side is usually the DataNET ‘A’ Hub and the right side the DataNET
‘B’ Hub. Each hub contains a DataNET Hub board and power supply.
The DNH connects to the Ethernet local area network via the RJ-45 STP
connector located on DataNET Hub board. Each of the boards has an
Ethernet connection. However, the DNH only the ‘A’ hub Ethernet port is
active.
HUB ‘ B’’
HUB ‘ A’
Only one Ethernet port is active in the DNH. The wiring connection be-
tween the two halves determines which half has the active Ethernet port.
A jumper wire visible across pin 1 and pin 2 on the cable connector indi-
cates that the side to which it is connected is the active port, which we
designate the ‘A’ Hub. The hub that has the inactive Ethernet connection
is the ‘B’ hub.
Remember, only one Ethernet port can be active.
CONNECTING
CABLE JUMPER
PINS 1&2
‘
A’ HUB
‘ B’ HUB
Description
ETHERNET PORT
Figure 2-4.Dual Hubs
Active Ethernet Port