Siemens TRAFFIC CONTROLS TC12 사용자 설명서

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TC12 Installation, Commissioning & Maintenance Handbook 
INTEGRAL OUTSTATION TRANSMISSION UNIT (OTU/LMU) 
6.1 GENERAL 
OVERVIEW 
This section describes the Integral OTU/LMU. This is an additional PCB that can 
be used in the TC12 System. It can be fitted in T400 or ST800 traffic controllers or 
the ST700 pelican controller and used to communicate with a central office 
Instation Transmission Unit. In this respect the description of the relationship 
between OTUs and ITUs, given in the TC12 System Overview of section 1.6, is 
applicable. However there are a number of differences between the Integral OTU 
described in this section and the Freestanding OTU described in detail in Section 
3. The main difference is that the Integral OTU can only be fitted in T400 and 
ST800 Traffic Controllers and the ST700 Pelican Controller. The Freestanding 
OTU on the other hand can be fitted to a variety of traffic controllers. 
 
In more detail the differences between the Integral OTU and the Freestanding 
OTU are as follows: 
The Integral OTU does not contain the two input/output connectors (used on the 
freestanding OTU to connect to the controller and/or detector cards), instead it 
contains a connector which is attached to the Extended System Bus Cable. All 
Information between the Controller and the Integral OTU is exchanged over this 
extended system bus.  
The Integral OTU does not contain a separate handset port but is configured using 
a handset attached to the Controller.  
The Integral OTU uses the UD facilities of the host controller. Handset commands 
such as CUD and UDT require maintenance level access as they are ST400/800 
commands. 
The Integral OTU can provide an LMU/RLM facility on the T400 only, and a 
connector allows current and voltage monitoring transformers to be attached for 
this purpose.  
There is a pair of test jacks on the board to allow connection to the instation test 
set to monitor communications data and measure signal levels.  
 
Note that except for physical board installation and LMU Voltage sensing the 
Integral OTU is the same as the Freestanding OTU. For message protocol and 
handset commands etc refer to earlier sections of the handbook. This Section 
details the differences between the Freestanding OTU and the Integral OTU. 
 
See 667/1/25190/000 and 667/DZ/25190/000 for options available and family tree 
for this product. These are not included in this manual.  
 
666/HE/43100/000  
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