Cyclades ACS48, 2.3.0 user manual Oid, See Object Identifier, Packet, Parity

Glossary

have one or more branches, or will terminate with a leaf node. The format of OID is a sequence of numbers with dots in between.

There are two roots for Object Identifiers, namely iso and ccit. iso starts with .1 and ccit starts with .0. Most Object Identifiers start with .1.3.6.1, where 1=iso, 3=org, 6= dod, 1 = internet. The Internet sub-tree branches into mgmt and private.

To understand the concept of relative and absolute Object Identifiers, let us consider the AdventNet Object Identifier

.1.3.6.1.4.1.2162. It specifies the path from the root of the tree. The root does not have a name or a number but the initial 1 in this OID is directly below root. This is called an absolute OID. However, a path to the variable may be specified relative to some node in the OID tree. For example, 2.1.1.7 specifies the sysContact object in the system group, relative to the Internet (.1.3.6.1) node in the OID tree. This is called a relative OID.

Off-Line Data Buffering This is a CAS feature that allows capture of console data even

	when there is no one connected to the port.
OID	See Object Identifier.
Packet	A packet is a basic communication data unit used when
	transmitting information from one computer to another. The
	maximum length of a packet depends on the communication
	medium. As an example, in Ethernet networks the maximum
	length is1500 bytes. A data packet can be divided into two
	parts: the header part and the data part. The header contains
	information needed for communication between nodes; the
	data is the body of the packet that is ultimately received by
	the application.
Parity	In serial communications, the parity bit is used in a simple
	error detection algorithm. As a stream of data bits is formed,
	an extra bit, called the parity bit, is added. This bit is set on

148 AlterPath Console Server User Manual