Figure 34 - Integral Otu Pcb Layout And Switch Settings - Siemens TC12 Installation, Commissioning And Maintenance Handbook

The cover must ALWAYS be fitted before any cables are installed, and should
NEVER be removed whilst the telephone cable (from socket SK1 on the PCB) is
connected to the telephone network.

Figure 34 - Integral OTU PCB Layout and Switch Settings

SK2 - Reply
Closed '1'
SK3 - Control
when pushed
up. Open '0'
when pushed
down.
(Example
shown open)
SK1
6.3.2.3 Configuring the Switches on the Integral OTU PCB
Before any connectors are attached to the Integral OTU PCB, the configuration
switches need to be set up as described below. Figure 34 shows the position of
the switches on the PCB and the directions to set the switches to for different
options.
There are four switches on the PCB:
S1
S2
S3
S4
These are set as follows:
1.
Set to either 2 or 4 wire (see Figure 34) as required by the position indicated on
the installation sheet for the Integral OTU.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Status
LEDs
LP2 - Carrier Detect
LP3 - Transmit confirm
LP4 - Watchdog Fail
S3
Line level
switches
Line Jack
Sockets
600R
HI-Z
600R / HI-Z
Selector
6-Way Telecom Socket
- 2/4 Wire Select Switch
- Lithium Battery On/Off Switch
- Line Level Switch
- 600 Ohm/High Impedance Switch
S1 - 2/4 Wire Select Switch
Page 170
Processor
Firmware
PLD
2 wire
S1
2/4 Wire
Selector
4 wire
S4
Cover fixing
Covered area. (Cover same shape on bottom of PCB)
PLA
40-Way
extended
system bus
connector
Serial
No.
S2
On Off
Battery
ON/OFF
B1
Lithium Battery
60-Way
connector for
LMU inputs
Issue 10
PLB