What is the difference between CAN and MAN?

A Campus Area Network (CAN) and Metropolitan Area Network (MAN) are both intermediate network types that bridge the gap between Local Area Networks (LAN) and Wide Area Networks (WAN), but they serve different purposes and cover different geographical areas.

Campus Area Network (CAN)

A Campus Area Network (CAN) is a network that interconnects multiple LANs within a limited geographical area, typically spanning a university campus, corporate campus, or military base. CAN uses the same technology and hardware across multiple buildings within the same organization or association.

CANs are cost-effective and simple to implement within a few kilometers radius. They are particularly beneficial for universities and corporate organizations, allowing users to work from any building while maintaining consistent data transfer speeds. The key characteristic is that all connected computers share organizational relationships.

Metropolitan Area Network (MAN)

A Metropolitan Area Network (MAN) is a larger network that covers an entire city or metropolitan area. MAN uses similar technology to LAN but operates at a much larger scale, typically covering 5-50 kilometers. It can interconnect multiple LANs and CANs across a city, similar to cable TV networks.

MAN supports data transfer rates from 34 Mbps to 150 Mbps and commonly uses the Dual Queue Dual Bus (DQDB) protocol. This protocol operates with two unidirectional buses and can use either open bus or closed bus architecture. MANs typically use broadband cables or optical fiber as transmission media.

Types of MAN

• DQDB (Distributed Queue Dual Bus) − Uses dual bus configuration where each host connects to two backbone network lines.

• SMDS (Switched Multimegabit Data Services) − High-speed MAN that enables packet switching and connects multiple LANs for datagram service.

CAN vs MAN Comparison

Conclusion

CAN serves organizations by connecting multiple buildings within a campus using standard LAN technology, while MAN provides city-wide connectivity using specialized protocols like DQDB. CAN focuses on organizational efficiency, whereas MAN enables broader metropolitan communication infrastructure.