Quick Eagle Networks DL3800E manual Multidrop, NI Network Interface, NRZ Non-Return to Zero

G

multidrop

A communications arrangement where multiple devices share a common transmission channel, though only one may transmit at a time.

N

NEBS

A network Equipment Building Systems requirement. A standard issued by Bellcore that spells out central office standards for grounding, cabling and power.

network

An interconnection of computer systems, terminals, or data communications facilities.

NI (Network Interface)

The point of demarcation between the customer premises and the carrier's network, usually drawn at the network connector on the rear panel of the Quick Eagle Networks access device.

NRZ (Non-Return to Zero)

Abinary encoding and transmission scheme where “ones” and “zeros” are represented by opposite, and alternating, high and low voltages.

NRZI (Non-Return to Zero Inverted)

A binary encoding technique that inverts the signal on a “one” and leaves the signal unchanged for a “zero,” where a change in voltage state signals a “one” bit and the absence of a change denotes a “zero” bit value.

O

OOS (Out of Service)

A digital network trouble signal.

OOF (Out of Frame)

An error checking scheme. An OOF occurs when two out of four consecutive framing bits are in error.

P

parity bit

An additional, non-informational bit appended to a group of bits indicating that the number of “ones” in the bits group is odd or even.

parity check

A process of error checking using the parity bit.

G-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001