Black Box LGB2002A-R2, LGB2003A-R2 Specifications

Connect 8, 16, or 24 twisted-pair devices
or segments together and to a fiber network.
Connect 8, 16, or 24 twisted-pair devices
or segments together and to a fiber network.
Back Office Switches
© 2008. All rights reserved. Black Box Corporation.
FREE 24-hour Tech Support: 724-746-5500
blackbox.com
2 of 6
1/4/2008 #26518
724-746-5500 blackbox.com
FEATURES
• Ideal for small or mid-sized office networks.
• Port mirroring isolates network errors while maintaining steady data flow.
• VLAN partitioning ensures optimum network security and performance.
• Choose from three fiber uplink modules to add distance to your network.
• Manage the switch via SNMP or the Web.
When the Back Office Switches are configured in a port-based VLAN, the same VLAN members can’t be located on different switches, every VLAN member can’t access all other VLAN members, and the switch manager has to assign different names for each VLAN group at one switch.
When configured as an attribute-based VLAN, the same VLAN members can be at different Back Office Switches with the same VLAN ID.
24-Port Back Office Switch
(LGB2003A)
VLAN1
VLAN2
VLAN3
VLAN4
VLAN1
VLAN2
VLAN3 VLAN4
16-Port Back Office Switch (LGB2002A)
with a Small Form Factor Pluggable
Optical Transceiver Installed
16-Port Back Office Switch (LGB2002A)
with a Small Form Factor Pluggable
Optical Transceiver Installed
3 of 6
1/4/2008 #26518
724-746-5500 blackbox.com
Link up to 8, 16, or 24 Ethernet, Fast Ethernet, or Gigabit
Ethernet devices to a twisted-pair network with BLACK BOX
®
Back Office Switches.
The switches are perfect for small and mid-sized networks. To cascade multiple switches, both models support up to eight trunking groups. The LGB2008A links to up to four ports per trunk, the LGB2002A supports up to eight ports per trunk, and the LGB2003A handles up to 12 ports per trunk.
With port mirroring, data traveling to each switch port is copied (or ”mirrored”) to a separate virtual port. The switch uses these virtual ports to isolate network errors without interrupting data flow.
Enhanced Quality of Service (QoS) ensures real-time applications. QoS enables the switch to support the ToS field of an IP header (equal DSCP low 3 bits) on Layer 3 of network framework and six kinds of special transmission events on Layer 4.
The switch also supports port-based VLAN and IEEE 802.1Q Tag VLAN. VLAN configuration is used to partition a LAN into smaller, more manageable LANs. With smaller LANs, security and performance are maximized. Up to 16 VLANs can be active, and VLAN IDs span from 1 to 4094.
Each twisted-pair device or segment can be located up to 328 feet (100 m) from the switch. And if you want to take advantage of fiber optic cable’s longer distance capability, choose one of the Small Form Factor Pluggable (SFP) Optical Transceivers. Three models are available: The LGB200C-MLC works over multimode fiber optic cable and increases the distance to 1804.4 feet (550 m). The LGB200C-SLC10 uses single-mode fiber and supports distances up to 6.3 miles (10.1 km). And the LGB200C-SLC30 works over single-mode fiber optic cable and supports distances up to 18.9 miles (30.4 km).
Connect 8, 16, or 24 10/100/1000 twisted-pair devices, 7, 15, or 23 twisted-pair devices and one fiber module, or 6, 14, or 22 twisted-pair devices and two fiber links.
The switch meets common network standards, including IEEE 802.3, 802.3u, 802.3ab, 802.3z, 802.3x and 802.3q.
Configure and manage the switch via its SNMP port or via a Web connection.
Using the switch’s aggregation feature, you can bundle more than one port with the same speed, full-duplex operation, and the same MAC address into one logical port. The single port’s resulting bandwidth is greater than that of the ports linked separately.
OVERVIEW
TECH SPECS
Distance (Maximum) — LGB2008A, LGB2002A–LGB2003A: 328 ft.
(100 m) over Category 5 or 5e unshielded twisted-pair cable; LGB200C-MLC: Up to 1804.4 ft. (550 m) over 850-nm multimode fiber; LGB200C-SLC10: Up to 6.3 mi. (10.1 km) over 1310-nm single-mode
fiber; LGB200C-SLC30: Up to 18.9 mi. (30.4 km) over 1550-nm single-mode
fiber
Flow Control — IEEE 802.3x compliant for full-duplex, backpressure flow
control for half-duplex
Forwarding/Filtering Rate — 14,800 pps at 10 Mbps, 148,000 pps at
100 Mbps, 1,488,000 pps at 1000 Mbps
MAC Addresses — 8K, 4K VLAN table entries Speed — LGB2008A, LGB2002A–LGB2003A: 10/100/1000 Mbps;
LGB200C-MLC, LGB200C-SLC10, LGB200C-SLC30: 1000 Mbps
Standards — IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z,
IEEE 802.3x, IEEE 802.3q
User Controls — Reset button Connectors — LGB2008A: (8) 10-/100-/1000-Mbps twisted-pair RJ-45,
(2) Gigabit twisted-pair/SFP fiber slots for fiber modules,
(1) power connector; LGB2002A: (16) 10-/100-/1000-Mbps twisted-pair RJ-45,
(2) Gigabit twisted-pair/SFP fiber slots for fiber modules,
(1) power connector; LGB2003A: (24) 10-/100-/1000-Mbps twisted-pair RJ-45,
(2) Gigabit twisted-pair/SFP fiber slots for fiber modules,
(1) power connector; LGB200C-MLC, LGB200C-SLC10, LGB200C-SLC30: (2) LC
Indicators — LGB2008A: (19) LEDs: (1) Power, (8) 10-/100-/1000-Mbps
twisted-pair ports 1–16, (8) Link/Act, (2) 1000-Mbps SFP fiber ports
15–16; LGB2002A: (35) LEDs: (1) Power, (16) 10-/100-/1000-Mbps twisted-pair
ports 1–16, (16) Link/Act, (2) 1000-Mbps SFP fiber ports 15–16; LGB2003A: (51) LEDs: (1) Power, (24) 10-/100-/1000-Mbps twisted-pair
ports 1–24, (24) Link/Act, (2) 1000-Mbps SFP fiber ports 23–24
Temperature Tolerance — 32 to 122° F (0 to 50° C) Relative Humidity — Up to 90%, noncondensing Power — 100–240 VAC, 50–60 Hz, autosensing Size — LGB2008A: 1.75"H (1U) x 5.2"W x 8.5"D (4.4 x 13.2 x 21.7 cm);
LGB2002A–LGB2003A: 1.75"H (1U) x 17.4"W x 8.2"D
(4.3 x 44.2 x 20.8 cm)
4 of 6
1/4/2008 #26518
724-746-5500 blackbox.com
LGB2002A
Ethernet hubs vs. Ethernet switches.
Although hubs and switches look very similar and are connected to the network in much the same way, there is a significant difference in the way they function.
What is a hub?
An Ethernet hub is the basic building block of a twisted­pair (10BASE-T or 100BASE-TX) Ethernet network. Hubs do little more than act as a physical connection. They link PCs and peripherals and enable them to communicate over a network. All data coming into the hub travels to all stations connected to the hub. Because a hub doesn’t use management or addressing, it simply divides the 10- or 100-Mbps bandwidth among users. If two stations are transferring high volumes of data between them, the network performance of all stations on that hub will suffer. Hubs are good choices for small- or home-office networks, particularly if bandwidth concerns are minimal.
What is a switch?
An Ethernet switch, on the other hand, provides a central connection in an Ethernet network in which each connected device has its own dedicated link with full bandwidth. Switches divide LAN data into smaller, easier-to-manage segments and send data only to the PCs it needs to reach. They allot a full 10 or 100 Mbps to each user with addressing and management features. As a result, every port on the switch represents a dedicated 10- or 100-Mbps pathway. Because users connected to a switch do not have to share bandwidth, a switch offers relief from the network congestion a shared hub can cause.
What to consider when selecting an Ethernet hub:
Stackability. Select a stackable hub connected with a special
cable so you can start with one hub and add others as you need more ports. The entire stack functions as one device.
Manageability. Choose an SNMP-manageable hub if you
have a large, managed network.
What to consider when selecting an Ethernet switch:
Manageability. Ethernet switches intended for large
managed networks feature built-in management, usually SNMP.
OSI Layer operation. Most Ethernet switches operate at
“Layer 2,” which is for the physical network addresses (MAC addresses). Layer 3 switches use network addresses, and incorporate routing functions to actively calculate the best way to send a packet to its destination. Very advanced Ethernet switches, often known as routing switches, operate on OSI Layer 4 and route network traffic according to the application.
Technically Speaking
The two most common Ethernet switch applications.
1. Segmenting LANs with multiple file servers:
Multiple users contending for multiple file servers can wreak havoc on network efficiency. That’s because Ethernet routes all data transmitted onto the network to every attached device until it reaches its proper destination.
By segmenting your LAN with an Ethernet switch, you can effectively reduce such bottlenecks by creating multiple wire­speed pathways to key components, so your data moves as fast as possible over the most direct route.
2. Adding high-speed workgroups:
You have a 10-Mbps LAN and you need to add a high­speed workgroup, but you’re not yet ready to make the full switch to 100 Mbps.
With an Ethernet switch, you can configure a dedicated 100-Mbps link and segment the remainder of your network— boosting the performance capabilities of all attached devices!
Technically Speaking
Modular construction. A modular switch enables you to populate a chassis with modules of different speeds and media types. Because you can easily change modules, the modular switch is an adaptable solution for large, growing networks.
Stackability. Some Ethernet switches can be connected to form a stack of two or more switches that functions as a single network device. This enables you to start with fewer ports and add them as your network grows.
5 of 6
1/4/2008 #26518
724-746-5500 blackbox.com
LGB2003A: front view
Gigabit Ethernet.
As workstations and servers migrated from ordinary 10-Mbps Ethernet to 100-Mbps speeds, it became clear that even greater speeds were needed. Gigabit Ethernet was developed for an even faster Ethernet standard to handle the network traffic generated on the server and backbone level by Fast Ethernet. Gigabit Ethernet delivers an incredible 1000 Mbps (or 1 Gbps), 100 times faster than 10BASE-T. At that speed, Gigabit Ethernet can handle even the traffic generated by campus network backbones. Plus it provides a smooth upgrade path from 10-Mbps Ethernet and 100-Mbps Fast Ethernet at a reasonable cost.
Compatibility
Gigabit Ethernet is a true Ethernet standard. Because it uses the same frame formats and flow control as earlier Ethernet versions, networks readily recognize it, and it’s compatible with older Ethernet standards. Other high-speed technologies (ATM, for instance) present compatibility problems such as different frame formats or different hardware requirements.
The primary difference between Gigabit Ethernet and earlier implementations of Ethernet is that Gigabit Ethernet almost always runs in full-duplex mode, rather than the half­duplex mode commonly found in 10- and 100-Mbps Ethernet.
One significant feature of Gigabit Ethernet is the improvement to the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) function. In half-duplex mode, all Ethernet speeds use the CSMA/CD access method to resolve contention for shared media. For Gigabit Ethernet, CSMA/CD has been enhanced to maintain the 200-meter (656.1-ft.) collision diameter.
Affordability and adaptability
You can incorporate Gigabit Ethernet into any standard Ethernet network at a reasonable cost without having to invest in additional training, cabling, management tools, or end stations. Because Gigabit Ethernet blends so well with your other Ethernet applications, you have the flexibility to give each Ethernet segment exactly as much speed as it needs—and if your needs change, Ethernet is easily adaptable to new network requirements.
Gigabit Ethernet is the ideal high-speed technology to use between 10-/100-Mbps Ethernet switches or for connection to high-speed servers with the assurance of total compatibility with your Ethernet network.
When Gigabit Ethernet first appeared, fiber was crucial to
Technically Speaking
running Gigabit Ethernet effectively. Since then, the IEEE802.3ab standard for Gigabit over Category 5 cable has been approved, enabling short stretches of Gigabit speed over existing copper cable. Today, you have many choices when implementing Gigabit Ethernet:
1000BASE-X
1000BASE-X refers collectively to the IEEE802.3z standards:
1000BASE-SX, 1000BASE-LX, and 1000BASE-CX.
1000BASE-SX: The “S“ in 1000BASE-SX stands for “short.“ It uses short wavelength lasers, operating in the 770- to 860­nanometer range, to transmit data over multimode fiber. It’s less expensive than 1000BASE-LX, but has a much shorter range of 220 meters over typical 62.5-µm multimode cable.
1000BASE-LX: The “L“ stands for “long.“ It uses long wavelength lasers operating in the wavelength range of 1270 to 1355 nanometers to transmit data over single-mode fiber optic cable. 1000BASE-LX supports up to 550 meters over multimode fiber or up to 10 kilometers over single-mode fiber.
1000BASE-CX: The “C“ stands for “copper.“ It operates over special twinax cable at distances of up to 25 meters. This standard never really caught on.
Gigabit over CAT5—1000BASE-TX
The 802.3ab specification, or 1000BASE-TX, enables you to run IEEE-compliant Gigabit Ethernet over copper twisted-pair cable at distances of up to 100 meters of CAT5 or higher cable.
Gigabit Ethernet uses all four twisted pairs within the cable, unlike 10BASE-T and 100BASE-TX, which only use two of the four pairs. It works by transmitting 250 Mbps over each of the four pairs in 4-pair cable.
6 of 6
1/4/2008 #26518
724-746-5500 blackbox.com
Item Code
Back Office Switches
8-Port LGB2008A
16-Port LGB2002A-R2 24-Port LGB2003A-R2
Small Form Factor Pluggable (SFP) Optical Transceivers
Multimode, 850-nm, 550 m LGB200C-MLC Single-Mode, 1310-nm, 10 km LGB200C-SLC10 Single-Mode, 1550-nm, 30 km LGB200C-SLC30
You might also need cable…
GigaBase®350 CAT5e 350-MHz Patch Cable,
4-Pair, Straight-Pinned, PVC, Beige, s10-ft. (3-m) EVNSL85-0010
LGB2003A: rear view
Virtual LANs (VLANs).
True to their name, VLANs are literally “virtual“ LANs— mini subLANs that, once configured, can exist and function logically as single, secure network segments, even though they may be part of a much larger physical LAN.
VLAN technology is ideal for enterprises with far-reaching networks. Instead of having to make expensive, time­consuming service calls, system administrators can configure or reconfigure workstations easily or set up secure network segments using simple point-and-click, drag-and-drop management utilities. VLANs provide a way to define dynamic new LAN pathways and create innovative virtual network segments that can range far beyond the traditional limits of geographically isolated workstation groups radiating from centralized hubs.
For instance, using VLAN switches, you can establish a secure VLAN made up of select devices located throughout your enterprise (managers’ workstations, for example) or any other device that you decide requires full access to the VLAN you’ve created.
According to Cisco, a VLAN is a switched network logically segmented by functions, project teams, or applications regardless of the physical location of users. You can assign each switch port to a different VLAN. Ports configured in the same VLAN share broadcasts; ports that don’t belong to the VLAN don’t share the data.
VLAN switches group users and ports logically across the enterprise—they don’t impose physical constraints like in a shared-hub architecture. In replacing shared hubs, VLAN switches remove the physical barriers imposed by each wiring closet.
To learn more about smart networking with VLANs, call the experts in our Local Area Network Support group at 724-746-5500, press 1, 2, 4.
Technically Speaking
Recognize any of these situations?
• You wait more than 30 minutes to get through to a vendor’s tech support.
• The so-called “tech” can’t help you or gives you the wrong answer.
• You don’t have a purchase order number and the tech refuses to help you.
• It’s 9 p. m. and you need help, but your vendor’s tech support line is closed.
According to a survey by Data Communications magazine, 90% of network managers surveyed say that getting the technical support they need is extremely important when choosing a vendor. But even though network managers pay anywhere from 10 to 20% of their overall purchase price for a basic service and support contract, the technical support and service they receive falls far short of their expectations— and certainly isn’t worth what they paid.
At Black Box, we guarantee the best value and the best support. You can even consult our Technical Support Experts before you buy if you need help selecting just the right component for your application.
Don’t waste time and money— call Black Box today.
Why Buy From Black Box? Exceptional Value. Exceptional Tech Support. Period.
Loading...