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Can anybody tell me why it is said that in SS7 signalling, signalling and voice take different paths. I think the same E1 16th time slot is used. If different trunks are used then it would be a burden on the system's capacity. I am so confused here.
Has anybody some information about this book
GSM, GPRS and EDGE Performance: Evolution Towards 3G/UMTS
By: Timo Halonen (Editor), Javier Romero (Editor), Juan Melero (Editor)
Can the pdf version of it can be freely available.
I work in a landline telephony company. I am measuring the voltage through multimeter but after isolation of the lines ( utp ) from the exchange. Voltages upto 50 volts have been observed. In our exchange -48 V is extended to subscriber for dial tone and 80 V AC for ringing. After isolation from...
can anybody tell me how unwanted dc voltages can be generated in twisted pair cables laid for telephony purposes underground. I think that EMI and other couplings only generate ac voltages. Can there be any reason?
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