3Com 09-1324-000 manual Decimal. The Dlci identifies a virtual circuit on the Frame, @22, 107.44

Learning About the User Interface 6-13

Frame Relay

Requires an address called a Data Link Connection Identifier (DLCI).

DLCIs are assigned by the appropriate authority at subscription

time. A DLCI follows an at sign (@) and can range from 1 through

1022 decimal. The DLCI identifies a virtual circuit on the Frame

Relay network, and is used by the local bridge/router to send a

packet to a router on the other end of the circuit. The following is

an example of a Frame Relay address:

@22

In the standard (local) addressing convention, the DLCI number has

only local significance; a duplicate number can be used by other

bridge/routers. In the global addressing convention, identifiers used

throughout the Frame Relay network are unique, and all traffic to a

node has the same destination DLCI number.

ATM

Consists of an 8-bit virtual path identifier (VPI) and a 16-bit virtual

circuit identifier (VCI), usually represented in VPI.VCI format, where

VPI is a decimal number between 0 and 255 and VCI is a decimal

number between 0 and 65,535. The following is an example of an

Asynchronous Transfer Mode (ATM) address:

107.44

Some vendors’ DSUs require an ATM address that consists of a 0-bit

VPI and a 10-bit VCI. In this case, the 10-bit VCI maps directly to a

Frame Relay DLCI.

SMDS

There are two types of Switched Multimegabit Data Service (SMDS)

addresses: individual addresses, for unicast traffic, and group

addresses, for multicast traffic. An individual address routes data to

a unique node. Packets sent to a group address are delivered to all

nodes that share that address. Both types of address begin with a

dollar sign. They are distinguished by the first or control digit:

hexadecimal C for an individual address and hexadecimal E for a

group address. Each address has 15 decimal digits following the

control digit and resembles a telephone number. The software

automatically right-pads shorter addresses with hexadecimal F to

the full length. The following are examples of individual and group

SMDS addresses:

C14085551212FFFF

Individual Address

E14085551234FFFF

Group Address

X.25

Consists of up to 15 decimal digits and can vary in length. The

address looks similar to a telephone number and is preceded by a

pound sign (#). An X.25 address is also referred to as a data

terminal equipment (DTE) address.