The switching units have a capacity of about 117 000 lines.
2.
Relay commands activate the coils of electromagnetic relays in the central power switching unit.
3.
BSNL Chennai Telephones has commissioned a Remote Switching Unit ( RSU ) exchange at Perungalathur.
4.
The other day a telephone repairman was working on a switching unit down the street.
5.
*Main Bus Switching Unit ( MBSU ) weight 220 lb ?4 units on S0 Truss.
6.
*Direct Current Switching Unit ( DCSU ) weight 218 lb x 2 units each on the 4 IEAs.
7.
American Power Conversion makes a heavy-duty, foot-long AC power-cable extender, intended for use with its PowerDirector switching unit but helpful with any device.
8.
Typically, small towns or communities have telephone services provided from a " remote switching unit " which is controlled by the more powerful host switching complex.
9.
Larger towns / regions may have several remote switching units which required backdoor trunking to connect all remote units during ESA within the same town / community.
10.
No modifications were required on the Underground trains for this change, but electrical switching units are at the lineside where Underground trains pass from one system to the other.
