Number Five Crossbar Switching System

Number Five Crossbar Switching System
Results: 1

#	Item
1	PDF Document Add to Reading List Source URL: www.historyofphonephreaking.org Language: English - Date: 2008-08-21 12:13:25 Panel switch Dual-tone multi-frequency signaling Direct distance dialing Signalling System No. 7 Multi-frequency signaling Single-frequency signaling Number Five Crossbar Switching System Rotary dial Telephone Telephony Telephone exchanges Signaling