000			00573nam a2200193Ia 4500
008			231030s9999 xx 000 0 und d
020			_a9788120350830
082			_a621.382 THI
100			_aThiagarajan Viswanathan
245		0	_aTelecommunication switching systems and networks
250			_a2nd ed.
260			_aDelhi: _bPHI Learning Private Limited, _c2020.
300			_axx, 620 p.
650			_aData transmission systems
650			_aIntegrated services digital networks
650			_aTelecommunication systems
700			_aBhatnagar, Manav
942			_cEBK
999			_c44023 _d44023