Ac Power And "Protective Earth" Test; Ksu Mounting Considerations; Prior To Installation - Toshiba Strata DK40 Installation & Maintenance Manual

KSU Mounting Considerations

CAUTION!

AC Power and "Protective Earth" Test

Test the "protected earth" for continuity by measuring the resistance of the earth. This will
test the earth connection and can be carried out by using a commercially available earth loop
impedance meter. The result of the reading of this test must be less than one ohm.
WARNING!
CAUTION!
If the above test show the system to be inadequately earthed, the condition should be
corrected by a qualified electrician before the system is connected.
KSU Mounting Considerations
The Base KSU and the optional Expansion KSU are both designed to be mounted on a wall
or other vertical surface. Toshiba recommends using method 1 or 2

Prior to Installation

1. Loosen the screws on the front cover and the side cover of the Base KSU, remove the
covers
2. Place the BATT jumper plug (SW2) to the ON position
3. Ensure that SW1 is set for A (A law operation).
4. Install an Exchange line board, either the TCOU or the TBSU onto the TMAU board
(see Figure
The TCOU provides four loop start Exchange lines.
The TBSU provides 2 ISDN BRI Circuits (4 B channels) TE/NT switchable.
5. Set Exchange line card switches.
TCOU: Set the TCOU PAD switches (SW400-SW475) to the appropriate position
Figure
PBX or are in close proximity to the local exchange the PAD position may be required.
TBSU: Set the TBSU PAD switches to the appropriate position for NT or TE operation.
(See Figure 2-21).
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Lack of proper earth may cause improper operation and, in extreme
cases, system failure.
Hazardous voltages that may cause death or injury are
exposed during the following test. Use great care when
working with AC power line voltage.
If the reading is greater than one ohm, the system is not adequately
earthed.
(see Figure 2-5). Figure 2-6
2-7).
2-19). The factory setting is NORMAL. If Exchange lines are connected to a
details the interior.
(see Figure
DK40 Installation
(see Figure 2-4).
2-6).
(see
2-5