User guide

CPIP. Carrier Pigeon Internet Protocol. RFC 1149 - Standard for the trans-

mission of IP datagrams on avian carriers. The IP datagram is printed, on a

small scroll of paper, in hexadecimal, with each octet separated by whit-

estuff and blackstuff. The scroll of paper is wrapped around one leg of the

avian carrier. A band of duct tape is used to secure the datagram's edges.

The bandwidth is limited to the leg length. The MTU is variable, and paradox-

ically, generally increases with increased carrier age. A typical MTU is 256

milligrams. Some datagram padding may be needed. Upon receipt, the duct

tape is removed and the paper copy of the datagram is optically scanned

into an electronically transmittable form.

crossover cable. Cable that lets you connect a port on one Ethernet hub to

a port on another Ethernet hub. You can order an Ethernet crossover cable

from Netopia, if needed.

CSU/DSU. Channel Service Unit/Data Service Unit. Device responsible for

connecting a digital circuit, such as a T1 link, with a terminal or data com-

munications device.

-----D-----

data bits. Number of bits used to make up a character.

datagram. Logical grouping of information sent as a network-layer unit.

Compare frame, packet.

DCE. Digital Communication Equipment. Device that connects the communi-

cation circuit to the network end node (DTE). A modem and a CSU/DSU are

examples of a DCE.

dedicated line. Communication circuit that is used exclusively to connect

two network devices. Compare dial on demand.

DES. Data Encryption Standard is a 56-bit encryption algorithm developed

by the U.S. National Bureau of Standards (now the National Institute of Stan-

dards and Technology).

3DES. Triple DES, with a 168 bit encryption key, is the most accepted vari-

ant of DES.