Schmid Watson Installation Guide Page 36

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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
27 Revision: 2002-09-10
CMU M
R
Tx A
Tx B
Rx A
Rx B
LTU MR
Tx A Tx B Rx A Rx B
LTU MR
Tx A
LTU MR
Tx A Tx B Rx A Rx B
X.2
5
or LAN
Management
Center
TMN
Interface
Figure 3-13: TMN Bus 4-Wire Connection for Minirack Units
3.6.2 TIA/EIA-485 2-wire Bus
TMN communication can be established via an EIA-485 2-wire connection as well. In this case
no crossing of signals between CMU and LTU is required.
CMU M
R
Tx ATx BRx A Rx B
LTU MR
Tx A Tx B Rx A Rx B
LTU MR
Tx A Tx B Rx A Rx B
X.25
or LAN
Management
Center
Figure 3-14: TMN Bus 2-Wire Connection for Minirack Units
A Plug-in version of the CMU is available as well. Due to the fact maximum 32 units can be
connected to an EIA-485 bus, 1 CMU is able to handle more than the 12 LTUs located in one
subrack. The extension of the TMN bus in the backplane towards a second subrack is realized by
means of the Alarm Control Unit (ACU).
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