A feature of the North American Numbering Plan that identifies customer dialed calls that are operator assisted, either by electronic or manual (human) means. [After T1.401-1988]

Abbreviation for zero transmission level point.

10/100 Mbps baseband twisted-pair (Ethernet)

In telephony, a noise weighting used in a noise measuring set to measure line noise as it would be perceived if the line were terminated with a No.144-receiver, or a similar instrument. Note: The meter scale readings are in dBrn (144-line).

In telephony, a noise weighting used in a noise measuring set to measure noise across the receiver of an instrument equipped with a No.144-receiver. Note: The meter scale readings are in dBrn (144-receiver).

Single Carrier Radio Transmission Technology.

2.5nd Generation Wireless

2nd Generation

3rd Generation

3rd Generation Partnership Project