TC12 Installation, Commissioning & Maintenance Handbook
For UK use the output power is always set to -13dBm and the receive threshold is
t for –13dBm is to be used in the UK for the output power
set to –39dBm.
No other setting excep
setting.
Set the 2/4 Wire Select Switch to the setting indicated on the installation sheet for
the Outstation (see Figure 21 for switch positions).
5 60 pe nc
I tion perfor d
engineer.
4. S4 - 2 / 4 Wire Select Switch
. S6 - 0 Ω / High Im da e Switch
nstalla is to be me by a qualified / authorised installation / service
0 WARNING 0
THIS SWITCH IS LOCATE D UNDER THE PCB COVER. FOR UK USAGE
THERE USE A E PARTS UNDER THE COVER. STC ARE NO R CCESSIBL
WARRAN BE NV LEFT OFF OR TY WILL I ALIDATED IF THE COVER IS
MISSING.
This switch is always set to the 600 Ω position for all Radial, Multi Point and/or
ulti Terminal lines. The switch is set to 600 Ω during manufacture and therefore
e is
line, the final OTU on the line is set to 600 Ω, all others on
e line need to be set to high impedance. Then the switch may be set as
et for
order to set the switch. No cabling should be connected at this stage,
ut before removing the cover make sure that the cable connected to socket SK4
etting the switch. See Figure 21 for switch settings.
ake a note of the switch setting on the OTU installation sheet for future
reference.
6. The PCB can now be replaced back in the card guides.
M
does not need to be changed. Where British Telecom or other telephone lin
supplier has agreed to provide Multi-drop circuits i.e. where more than one OTU
to be connected to one
th
appropriate for the OTU, as noted below. This also applies to dual OTUs where
both OTUs are connected to the same line - only one of the OTUs may be s
600 Ω if appropriate. The switch on the other OTU should be set to high
impedance.
Note to Service / Installation engineers:
This switch is located underneath the cover. The top half of the cover should be
removed in
b
of the PCB is not connected to the telephone network. Ensure the cover is re-fitted
correctly after s
M
666/HE/43100/000 Page 66 Issue 9