Communication solutions for power utilities
UNIVERSAL TELEPROTECTION TPU-1
INSTALLATION AND COMMISSIONING MANUAL Web version TPU-1R - Rev. 5.9 (May 2018)
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3.3
DIGITAL LINE INTERFACE MODULE
As can be seen in Figure 8, the IDTU.00 modules of version lower than 3.0 have two
jumpers, prepared for soldering, identified as S7 and S8, which must be carried out if one
wishes to connect the transmission and reception cable shields to earth, respectively. If the
jumper is not carried out, it is a floating shield.
The standard recommends to connect both shields to earth. Jumpers S7 and S8 are carried
out at the factory, which corresponds to the shield connected to earth.
As can be seen in Figure 9, the IDTU.00 modules of version 3.0 have the P1-P2 setting and
two jumpers prepared for soldering, identified as C97 and C98.
The P1-P2 setting allows the selection of the output impedance according to the type of
connector:
- P1:1 and P2:1 closed: 120
Ω (RJ-45).
- P1:1 and P2:1 open: 75
Ω (BNC).
In IDTU.00 modules of version 3.1, the type of connector (BNC or RJ-45) is programmed
from the TPU-1 Management System.
The solder jumpers C97 and C98 determine whether the cable shield is connected to earth
or not:
- C97 and C98 open:
Balanced
(cable shield
NOT
connected to earth). This
configuration is normally used for the
RJ-45
(120
Ω) connector.
- C97 and C98 closed:
Non-balanced
(cable shield connected to earth). This
configuration is normally used for the
BNC
(75
Ω) connectors.
