Power Supply; Device Installation In Form Of Md-72 Telecommunication Rack Card , Rear View; Sectional View - Lanex TM-77 Operating Manual

Figure 8. Device installation in form of MD-72 telecommunication rack card, rear view.
Figure 9. Installation of the devices in the form of a card in MD-72 telecommunication rack,

sectional view.

4.3

Power supply

TM-77 multiplexer can be supplied with 36÷60V DC voltage or 230V AC voltage. MD-77
card is supplied with 18÷60V DC voltage from TM-72 telecommunication rack. Power supply
connection is described in TM-72 rack operating manual. Power supply voltage parameters are
given in paragraph 7.6.
The correct power supply of the device is signalized by a light indicator
on the front panel.
36÷60V power supply unit voltage should be connected to the socket with external screw
connections. There is no requirement concerning polarity of power supply voltage.
The grounding should be connected to the grounding terminal on the casing. The grounding
cable should have low impedance for high frequencies.
Note. The device has no built-in disconnecting system, thus an easily accessible
disconnecting system should be mounted into the fixed cabling.
IOA77-1F
4 E1/G.703 P
X LESIOCHRONOUS
O
PERATING
15
M
ULTIPLEXER
M
ANUAL
MD-76.1 MD-77.1
May 2007