8- and 24-Port Gigabit L2 Managed Power-over-Ethernet (PoE) Switches
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2. Overview
2.1 Introduction
The 8-Port and 24-Port Gigabit L2 Managed Power-over-Ethernet Switches (LPB4008Aand LPB4024A) are standard switches that meet all IEEE
802.3/u/x/z Gigabit Ethernet specifications. The LPB4008A switch includes six 10-/100-/1000-Mbps TP ports and two Gigabit TP/SFP ports. The
LBP4024A switch includes twenty 10-/100-/1000-Mbps TP ports and four Gigabit TP/SFP ports. You can manage the switches through the RS-232
serial port via a direct connection, or through the Ethernet port using a CLI or Web-based management unit that’s associated with an SNMP agent.
Using the SNMP agent, the network administrator can log on to the switch to monitor, configure, and control each port’s activity. Via its intelligent
software, the switch also features ACL, IP-MAC Binding, DHCP Snooping, QoS (Quality of Service), Spanning Tree, VLAN, Port Trunking, Bandwidth
Control, Port Security, SNMP/RMON, and IGMP Snooping. Use it for both metro-LAN and office applications.
These PSE switches also comply with the IEEE 802.3af standard. An advanced auto-sensing algorithm enables power devices (PD) discovery,
classification, current limit, and other necessary functions. It also protects against short circuits and auto-detects power-out to the PD.
This switch’s Port 7 and Port 8 (LPB4008A) or Ports 21–24 (LPB4024A) include two types of media—TP and SFP Fiber (LC, BiDi LC…). These ports
support 10-/100-/1000-Mbps TP or 1000-Mbps SFP Fiber with auto-detect function. Use a 1000-Mbps SFP Fiber transceiver to expand a high-speed
connection.
• 1000-Mbps LC, Multimode, 50 m, SFP Fiber transceiver (LGB200C-MLC)
• 1000-Mbps LC, Single-Mode, 10 km, SFP Fiber transceiver (LGB200C-SLC10)
• 1000-Mbps LC, Single-Mode, 30 km, SFP Fiber transceiver (LGB200C-SLC30)
• 1000-Mbps BiDi LC, Single-Mode, 20 km, 1550 nm SFP Fiber WDM transceiver (LGB204C)
• 1000-Mbps BiDi LC, Single-Mode, 20 km, 1310 nm SFP Fiber WDM transceiver (LGB205C)
The 10-/100-/1000-Mbps TP standard Ethernet ports meet all IEEE 802.3/u/x/z Gigabit and Fast Ethernet specifications. The 1000Mbps SFP Fiber
transceiver has a Gigabit Ethernet port that fully complies with all IEEE 802.3z and 1000BASE-SX/LX standards.
The 1000-Mbps Single Fiber WDM (BiDi) transceiver is designed with an optic Wavelength Division Multiplexing (WDM) technology that transports a
bi-directional full-duplex signal over a single fiber simultaneously.
"Active PHY Power Management" and "Perfect Reach Power Management" help reduce power consumption.
The switch also supports the IEEE Standard 802.1ab Link Layer Discovery Protocol to provide a debugging tool and enhance the networking
management availability. It can auto-discover a device and its topology.
2.2 Features
QoS: Supports Quality of Service using the IEEE 802.1P standard. There are two priority queue and packet transmission schedules.
Spanning Tree: Supports IEEE 802.1D, IEEE 802.1w (RSTP: Rapid Spanning Tree Protocol) standards.
VLAN: Supports Port-based VLAN and IEEE802.1Q Tag VLAN;
Also supports 256 active VLANs and VLAN ID 1–4094.
Port Trunking: Supports static port trunking and port trunking with IEEE 802.3ad LACP.
Bandwidth Control: Supports ingress and egress per port bandwidth control.
Port Security: Allows or denies forwarding and port security according to MAC address.
SNMP/RMON
- SNMP agent and RMON MIB. The switch’s SNMP agent is client software that operates using SNMP protocol to receive commands from the SNMP
manager (server site) and echo the corresponding data (the MIB object). The SNMP agent actively issues TRAP information when it occurs.
- Remote Network Monitoring (RMON) is a branch of the SNMP MIB
- The switch supports MIB-2 (RFC 1213), Bridge MIB (RFC 1493), RMON MIB (RFC 1757)-statistics Group 1,2,3,9, Ethernet-like MIB (RFC 1643), and
Ethernet MIB (RFC 1643).
IGMP Snooping: Supports IGMP version 2 (RFC 2236): Use IGMP snooping to establish multicast groups that will forward multicast packets to
member ports, and won’t waste bandwidth while IP multicast packets are running over the network.
IGMP Proxy: multicast processing. The switch supports IGMP version 1 and IGMP version 2, to efficiently use network bandwidth, and
provide fast response time for channel changing. IGMP version 1 (IGMPv1) is described in RFC1112, and IGMP version 2 (IGMPv2) is
described in RFC 2236. Hosts interact with the system through the exchange of IGMP messages. Similarly, when you configure IGMP proxy,
the system exhanges IGMP messages with the router upstream. However, when acting as the proxy, the system performs the host portion
of the IGMP task on the upstream interface as follows:
- When queried, it sends group membership reports to the group.
