myerston@cts.sri.com (12/12/89)
Data over Voice (DOV) aka Speech+Plus is as old as the hills. All it does is use the >metallic< twisted pair bandwidth ABOVE the 4Khz voice band for data. Straight analog frequency division multiplexing, not digital, not magic. SLC-96 is the semi-generic name for Subscriber Loop Carriers. Originally WECO using metallic pairs carrying T-1 (24 channel) PCM multiplexed traffic. 5 T-1s per box, 1 for backup, 4 for traffic (24 * 4 = 96). Today SLCs can carry more channels, do concentration, use fiber etc. Pulse/DTMF. It is not true that only the 5ESS can detect whether a line in coming in Pulse of DTMF. At least the 1AESS does the same. Parameters set by Telco decide what to do (Ignore or print on the Maint TTY)