ADTRAN 1203019L2, Руководство пользователя

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61203019L1-1 NT1 ACE User Manual 9
NT1 ACE User Manual
Short Passive Bus Configuration
This configuration allows you to connect up to eight TEs at
any point on the bus. The bus length is limited to 600 feet, as
shown in Figure 5. To select the Short Passive Bus configu-
ration, the CONFIGURATION switch must be set to the
SHORT position. The bus terminating resistors can be
placed at any point along the bus. If the TEs have internal
terminating resistors that can be optioned, only one TE’s
termination resistor should be enabled. The TERMINA-
TION
switch should be placed in the 100 position, and only
one of the TEs connected should be terminated with 100
ohm. If the unterminated TEs are placed within 20 feet of
the NT1, the TERMINATION switch should be in the 50
position, and the TEs should not be terminated. These
switch settings should always be maintained, unless an
external 100 ohm resistor is being used. If an external termi-
nating resistor is used, set the TERMINATION switch to
the NONE position.
Figure 5. Short Passive Bus Configuration
TR
TR NT1
TE TE TE
600 Feet
*
*Not needed if NT1's
Termination Resistors
(TR) are used.