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1992-05-16
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HP Remote Bridge RB, Technical Data
Product Number 28674B
The HP Remote Bridge RB can connect one local and one remote
802.3/Ethernet LAN to form a single, integrated communications network
across geographically dispersed sites. An HP Universal Interface with
appropriate 5-meter interface cable to an external DSU/CSU provides
access to common services, such as T1, 64-Kbit/s and 56-Kbit/s Digital
Data Services. The HP Remote Bridge RB is a "learning bridge" that
filters each packet from the local and remote segments. This will
improve the throughput of the wide area link by forwarding only the
necessary traffic, thus conserving bandwidth. Since the HP bridges are
protocol-independent and "media speed," they can be used in a
multivendor environment without causing a network "bottleneck."
Coupled with HP OpenView Resource Manager, the HP Remote Bridge RB is
capable of providing instrumentation-like functions across your network.
This will eliminate the need for a LAN analyzer per segment. HP EASE
(Embedded Advanced Sampling Environment) is a breakthrough technology
that allows HP EtherTwist devices to do protocol analysis. This will
identify top talkers, heavy users, errors, and communication pairs.
The bridge sends and receives packets at the Media Access Control
layer, which is a sublayer of the ISO Data Link layer. From the
perspective of the end nodes that are exchanging data, the bridge is
invisible to higher-level protocols. The bridge listens to all traffic
between the two interconnected LAN segments and inspects the source and
destination addresses to decide whether the packet must be forwarded.
Features and Benefits
o The HP Remote Bridge RB can filter and forward data packets as fast as
the network can operate; this is called "media-speed" operation.
Ethernet/IEEE 802.3 is a 10-Mbit/s LAN, which is equivalent to 14,880
64-byte packets per second. To avoid a bottleneck in the LAN, a bridge
needs to filter 100 percent of the packets from the local 10-Mbit/s
LAN and remote link (56 Kbit/s, 64 Kbit/s, or T-1).
o The bridge conserves network capacity (bandwidth) by isolating local
traffic and only forwarding packets intended for the distant nodes.
o HP Remote Bridge RBs allow connection of geographically distant LANs
to form one global network. With decreasing costs of wide area links
and an increasing need to improve information systems, the low-cost
HP bridge is an ideal solution.
o HP bridges are easy-to-install, "plug and play" devices that are also
self-configuring. An external DSU/CSU is required.
o Critical remote links require the high quality of HP bridges.
o Unlike repeaters, bridges do not propagate corrupt packets from one
network to another. End-to-end data integrity is maintained.
o HP bridges are excellent devices for connecting LANs of different
media types. For example, the corporate backbone may use fiber-optic
or thick coaxial cable, and the smaller workstation subnet may use
thin, coax, or twisted-pair cable. The HP Remote Bridge RB can connect
these different media through the AUI and thinLAN ports.
o HP bridges allow for multivendor environments, since they operate at
the MAC sublayer of the ISO OSI model and are invisible to
higher-level protocols.
o HP bridges are "learning bridges." They automatically learn node
addresses by examining network traffic.
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o There are LED displays on the front and back of every HP bridge for
easy recognition of the bridge's operating condition. The LEDs will
indicate power, activity, fault, self-test, transmit, receive,
network, and bridge failure.
o HP bridges use the spanning tree algorithm developed by the IEEE 802.1
committee to support backup links between LANs in case of link
failure. The "spanning tree" algorithm permits IEEE 802.3/Ethernet
LANs be bridged in an arbitrary topology that includes alternative or
redundant paths. In the event of a primary link failure, a backup link
would take over thereby ensuring continued data transmission between
networks. Both the HP 10:10 LAN Bridge MB and the HP Remote Bridge RB
utilize this algorithm to enhance network reliability.
o HP bridges can be mounted in a standard 19-inch equipment rack or on a
wall using the detachable brackets that are included with every
bridge.
Console Interface
The HP Remote Bridge RB includes an RS-232 console port for monitoring
and control functions within the bridge. This easy-to-use interface
allows network administrators to check bridge status, spanning tree
configuration, network traffic statistics, and collisions; and to
perform basic diagnostics. The console interface uses a common command
set, similar to that of the HP EtherTwist Hub. New product updates to
the bridge firmware can be downloaded through the console port for
low-cost updates. The HP Remote Bridge RBs can be accessed using a
terminal or terminal emulator connected to the console port directly or
via modem.
Network Management
HP OpenView Interconnect Manager/DOS provides the ability to centrally
monitor and control the HP 10:10 LAN Bridge MB and the HP Remote Bridge
RB in an extended IEEE 802.3 or Ethernet LAN environment.
HP OpenView Interconnect Manager/DOS provides facilities to monitor
network traffic conditions, help identify and diagnose network problems,
enhance network security, and increase network reliability by
controlling bridges serving as redundant data paths.
Bridges are frequently used to interconnect and extend local area
networks. They are in an excellent position to provide information about
the network and its operation. HP OpenView Interconnect Manager/DOS, as
part of HP's comprehensive family of network management tools, provides
a powerful and easy-to-use facility for HP bridge monitoring and
control.
Environmental Characteristics
Operating Temperature: 0 degrees C to 55 degrees C (32 degrees F to
131 degrees F)
Relative Humidity: 5% to 95% at 40 degrees C (104 degrees F)
noncondensing
Physical Characteristics
Dimensions: 42.54 cm by 23.5 cm by 4.34 cm (16.75 in by 9.25 in by
1.71 in)
Weight: 2.72 kg (6.0 lb)
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Electrical Characteristics
ac Voltage 100-120 V 220-240 V
Current 0.5 A max 0.25 A max
Frequency 50/60 Hz 50/60 Hz
Ordering Information
The HP 28674B includes: Bridge assembly, power cord, rack/wall mount
kit, and installation manual.
Options:
001: V.35
002: RS-232
003: X.21
004: RS-422
The HP Bridge Troubleshooting Kit (HP 28689B) includes the following
loopback connectors: (2) AUI, BNC, V.35, and RS-232/DB-25
Warranty
HP 28674B Remote Bridge RB is warranted for one year against defects.
Check with your local Hewlett-Packard Sales Office or authorized HP LAN
Dealer for more information.
From HP Networking Communications Specification Guide,
5091-3821E, 9205, p 585
Associated files: A3821585.DOC
HP Remote Bridge RB, Technical Data