Page 48 - Handout Computer Network.

Figure 2-26 shown a Logical Topology of Network Devices

Broadcast topology simply means that each host addresses its data to a particular NIC, to a
multicast address, or to a broadcast address on the network medium. There is no order that the
stations must follow to use the network. It is first come, first serve. Ethernet also works this way, as
explained later in this course. The second logical topology is token passing. Token passing controls
network access by passing an electronic token sequentially to each host. When a host receives the
token, it can send data on the network. If the host has no data to send, it passes the token to the next
host, and the process repeats itself. Two examples of networks that use token passing are Token Ring
and FDDI, both of which are examples of token passing on a physical ring topology.

https://www.youtube.com/watch?v=i8lTo9VW_M0
https://www.youtube.com/watch?v=zbqrNg4C98U&t=4s
2.9 Broadband Integrated Services Digital Network (BISDN)

Definition Broadband Integrated Services Digital Network (BISDN) is an advanced
digital communication network designed to provide high-speed transmission of multiple

services such as voice, data, and video over a single network. It is considered an extension

of the traditional ISDN, but with much higher bandwidth and data rates.

Motivation for BISDN Traditional ISDN networks supported limited data rates such as:

• 64 kbps per channel
• 128 kbps in some configurations

These speeds were not sufficient for modern applications like:

• Video conferencing
• Multimedia services
• High-speed internet
• Large data transfer

To support these services, BISDN was developed to provide broadband communication.

2 9.1 Main Characteristics of BISDN

2.9.2 High Data Rates

BISDN supports very high transmission speeds, often in the hundreds of Mbps range.

2.9.3 Integration of Services

It integrates different types of communication services in one network:

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