
27
• Remove the DU/INT bottom cover to connect the
Ethernet cables. When removing the bottom cover, pinch
together the latches on both sides.
• On the DU/INT, the Ethernet cable may be connected to
the left or right DU/CU connection terminal because the
DU/INT does not distinguish between DU and CU
connection terminals.
2
Connecting the DUs/INTs together
Ethernet cable
Ethernet cable
To ATUC-50CU
1
Connect the DUs/INTs according to the
installation environment and operation method.
Daisy-chain connection:
Connect the DUs/INTs in a series to the DU CHAIN A/B (C/
D) terminals. Compared to ring connection, daisy-chain
connection enables the DUs/INTs to be placed even farther
from the CU.
End of the chain
End of the chain
If a connection failure occurs
here, the connection to the end
of the chain will be defunct.
Ring connection:
Connect as many DUs/INTs as necessary to each of the DU
CHAIN A/B terminals and then connect together the 2 DUs/
INTs on both ends of the chain so as to form a ring. Even if a
connection failure occurs somewhere in the ring, since the
connection is recognized as 2 daisy-chains using the DU CHAIN
A/B terminals, the influence of the failure can be minimized and
you can carry on conference control.
Even if a connection failure
occurs, since the connection is
recognized as 2 daisy-chains
using the DU CHAIN A/B
terminals, you can carry on
conference control.
One more ring connection can
be made by configuring these
terminals as the DU CHAIN
terminals.
• Combining different connection types is also possible,
such as a ring connection using the DU CHAIN A/B
terminals and daisy-chain connections using the DU
CHAIN C/D terminals.
Daisy-chain connection
Ring connection
2
Expand the system with EXT.
By adding EXT to the system, you can increase the number of DU/
INT/IU connections and extend the distance of the total extension
length of the connecting cable (LAN cable).
For instance, you can connect a total of 100 DUs/INTs/IUs, 50
units on either terminal, by connecting an EXT near the B terminal
when using a daisy chain connection on the DU CHAIN A/B
terminals.