ADTRAN 1212010, Руководство пользователя

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Appendix B. S/T Bus Configurations
B-2 NT1 T400 User Manual 61212016L1-20
EXTENDED PASSIVE BUS
This bus configuration allows the connection of up to eight TEs at
ranges up to 3000 feet from the NT1 Type 400, as illustrated in Figure
B-2.
To select this mode, set switch 1-2 to the Long position. A TR must be
centrally located to the TEs. The TRs in the NT1 Type 400 are enabled
by setting switches 1-3 and 1-4 to the ON position, and switches 1-5
and 1-6 to the OFF position. These switch settings should always be
maintained, unless an external 100
Ω
resistor is being used. If an exter-
nal TR is used, set switches 1-3 through 1-6 to the OFF position.
Figure B-2. Extended Passive Bus Configuration
TR TR* NT1
TE TE
* Is not needed if NT1Õs
TR
is used
3000
FEET
160
FEET