4 Making Network Connections

Connectivity Rules

When adding hubs (repeaters) to your network, please follow the connectivity rules listed in the manuals for these products. However, note that because switches break up the path for connected devices into separate collision domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices.

1000BASE-T Cable Requirements

All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four wire pairs are connected. However, it is recommended that for all critical connections, or any new cable installations, Category 5e (enhanced Category 5) or Category 6 cable should be used. The Category 5e specification includes test parameters that are only recommendations for Category 5. Therefore, the first step in preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the cable installation to be sure that it complies with the IEEE 802.3-2005 standards.

10 Gbps Ethernet Collision Domain

Table 4-1 Maximum 10GBASE-SR 10 Gigabit Ethernet Cable Length

Fiber Size

Fiber Bandwidth

Maximum Cable Length

Connector

62.5/125 micron

160 MHz/km

2-26 m

LC

single-mode fiber

 

(7-85 ft.)

 

62.5/125 micron

200 MHz/km

2-33 m

LC

single-mode fiber

 

(7-108 ft.)

 

50/125 micron

400 MHz/km

2-66 m

LC

single-mode fiber

 

(7-216 ft.)

 

50/125 micron

500 MHz/km

2-82 m

LC

single-mode fiber

 

(7-269 ft.)

 

50/125 micron

2000 MHz/km

2-300 m

LC

single-mode fiber

 

(7-984 ft.)

 

 

Table 4-2 Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length

 

 

 

 

Fiber Size

Fiber Bandwidth

Maximum Cable Length

Connector

 

 

 

 

9/125 micron

N/A

10 km (6.2 miles)

LC

single-mode fiber

 

 

 

 

Table 4-3 Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length

Fiber Size

Fiber Bandwidth

Maximum Cable Length

Connector

 

 

 

 

9/125 micron

N/A

40 km (24.85 miles)

LC

single-mode fiber

 

 

 

4-6

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SMC Networks SMC8926EM, SMC8950EM manual Connectivity Rules, 1000BASE-T Cable Requirements, Gbps Ethernet Collision Domain
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SMC8926EM, SMC8950EM specifications

SMC Networks has established itself as a prominent player in the networking and connectivity market, offering a range of professional solutions designed for small to medium-sized enterprises. Among its notable products are the SMC8950EM and the SMC8926EM, two advanced Ethernet switches that cater to the need for reliable and efficient networking.

The SMC8950EM is an enterprise-class managed switch that delivers high-performance capability with 48 10/100/1000Mbps Ethernet ports, providing extensive connectivity for various devices on a local area network. Its architecture is designed to handle high traffic loads, making it apt for environments where speed and reliability are paramount. This switch supports multiple protocols, including VLANs, which allow for flexible network segmentation and improved security. The SMC8950EM also features several Layer 2 and Layer 3 management protocols, enabling the switch to support advanced routing, Quality of Service (QoS), and network traffic management.

On the other hand, the SMC8926EM is a compact yet powerful switch equipped with 24 10/100/1000Mbps Ethernet ports, making it ideal for smaller installations or branch offices that require scalability without compromising on performance. With support for Power over Ethernet (PoE), the SMC8926EM simplifies the implementation of IP phones, security cameras, and wireless access points, making it particularly useful in environments where power outlets may be limited.

Both models employ advanced technologies, such as network storm control and link aggregation, to enhance performance and ensure seamless connectivity. They also provide comprehensive network monitoring capabilities, allowing administrators to manage traffic and troubleshoot issues proactively. The user-friendly web interface facilitates easier management and configuration, while SNMP support enables integration with existing network management systems for enhanced visibility and control.

Ultimately, the SMC8950EM and SMC8926EM represent robust networking solutions that address the challenges faced by modern enterprises. With their combination of high performance, advanced features, and scalability, these switches are well-suited for companies looking to build a reliable and efficient network infrastructure. Whether for a large organization or a small branch office, SMC Networks continues to deliver products that meet the evolving needs of users worldwide.
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