Black Box lb9902a Guia De Especificaciones
• Hardened Ethernet Switch
• Power supply
• Power cord
• Users’ manual
Compliance: FCC Part 15 Class A;
UL
®
1950; CE; Bellcore GR-63-
CORE Sections 4.4.1 and 4.4.3
(for shock and vibration)
(for shock and vibration)
Standards: 10BASE-T: IEEE 802.3;
100BASE-TX, -FX: IEEE 802.3u
Connectors: LB9901A, LB9904A:
(6) RJ-45 shielded 10/100;
(2) full-duplex multimode fiber
(1300-nm wavelength);
(2) full-duplex multimode fiber
(1300-nm wavelength);
LB9902A, LB9905A:
(6) RJ-45 shielded 10/100;
(1) full-duplex multimode fiber
SC, (1) full-duplex single-mode
fiber (1300-nm wavelength);
(1) full-duplex multimode fiber
SC, (1) full-duplex single-mode
fiber (1300-nm wavelength);
LB9903A, LB9906A:
(6) RJ-45 shielded 10/100;
(2) full-duplex single-mode SC
(1300-nm wavelength)
(2) full-duplex single-mode SC
(1300-nm wavelength)
Construction: 18-gauge steel case
Cooling Method: Convection, with
case operating as a heat sink
Filtering/Forwarding Rate:
From 100-Mbps ports:
Up to 148,800 pps;
From 10-Mbps ports:
Up to 14,880 pps
Latency: 10 to 100 Mbps or 100 to
10 Mbps: 5 µseconds
Mean Time Between Failure:
> 10 years
Indicators: (1) LED for power (PWR);
RJ-45 ports: (1) LED for speed,
link activity, transmitting and
receiving (LINK/ACT); (1) for
full- or half-duplex (F/H);
receiving (LINK/ACT); (1) for
full- or half-duplex (F/H);
Fiber ports: (1) LED for link
activity
Speed: RJ-45 ports: 10 or 100 Mbps,
autonegotiating, half- or
full duplex;
full duplex;
Fiber ports: 100 Mbps, full duplex
Temperature Tolerance: -40 to
+160°F (-40 to +70°C); cold starts
as low as -4°F (-20°C)
as low as -4°F (-20°C)
Humidity Tolerance: 10 to 95%
noncondensing
DC Power Supply: 18–70 VDC,
autoranging
Size: 9"H x 5.8"W x 1.7"D (22.9 x
14.7 x 4.3 cm)
Weight: 3.5 lb. (1.6 kg)
AC Power Supply Specifications
Electrical Efficiency: 70% minimum
Input: 85–260 VAC, 47–63 Hz,
autoranging
Output: 5 VDC, up to 3 amps
Power Dissipation: 3 watts (typical)
Surge Protection: More than
150 joules
Surge Clamping: 800 volts, 50 amps
(minimum)
Overload and Short Circuit
Protection: Input fuse
Size: 1.5"H x 6.5"W x 6.5"D (3.8 x
16.5 x 16.5 cm)
Weight: 2 lb. (0.9 kg)
Package Includes:
Specifications
Technically Speaking
The Hardened Ethernet Switch
chassis houses one main PC board.
The front side of the chassis has six
RJ-45 twisted-pair ports and two
100-Mbps, full-duplex fiber ports,
which operate in full-duplex mode
only to provide higher bandwidth
and longer distances on fiber.
The front side of the chassis has six
RJ-45 twisted-pair ports and two
100-Mbps, full-duplex fiber ports,
which operate in full-duplex mode
only to provide higher bandwidth
and longer distances on fiber.
With the its six 10/100 RJ-45
switched ports, the switch has an
architecture that supports a dual-
speed switching environment.
These copper ports, equipped
with autonegotiation capability,
operate in full or half-duplex and
sense for speed, per the IEEE 802.3u
standard.
architecture that supports a dual-
speed switching environment.
These copper ports, equipped
with autonegotiation capability,
operate in full or half-duplex and
sense for speed, per the IEEE 802.3u
standard.
Autonegotiation occurs when
an RJ-45 cable connection is made
on the copper ports and each time a
link is enabled. When the connected
device is 10 Mbps, the Hardened
Ethernet Switch obeys all the rules
of 10-Mbps Ethernet configurations.
10-Mbps users can share a
10-Mbps traffic domain and can
communicate with 100-Mbps users
as well as users in the 100-Mbps
domain. Similarly, 100-Mbps traffic
adheres to 100-Mbps Ethernet rules
and can communicate with the
10-Mbps domain, too.
on the copper ports and each time a
link is enabled. When the connected
device is 10 Mbps, the Hardened
Ethernet Switch obeys all the rules
of 10-Mbps Ethernet configurations.
10-Mbps users can share a
10-Mbps traffic domain and can
communicate with 100-Mbps users
as well as users in the 100-Mbps
domain. Similarly, 100-Mbps traffic
adheres to 100-Mbps Ethernet rules
and can communicate with the
10-Mbps domain, too.
The fiber optic ports are
switched ports and perform as a
domain, providing a high-bandwidth
backbone connection while
supporting longer distances, up
to 20 km (12.4 mi.) on models with
single-mode connections. You
can also daisychain the switches
in a string application to create an
Ethernet network that’s hundreds
of kilometers long.
domain, providing a high-bandwidth
backbone connection while
supporting longer distances, up
to 20 km (12.4 mi.) on models with
single-mode connections. You
can also daisychain the switches
in a string application to create an
Ethernet network that’s hundreds
of kilometers long.
You can connect the Hardened
Ethernet Switches to the following
three types of media: 100BASE-TX,
10BASE-T, and 100BASE-FX.
Packet filtering/forwarding.
three types of media: 100BASE-TX,
10BASE-T, and 100BASE-FX.
Packet filtering/forwarding.
Each time a packet arrives
on one of the switched ports, the
switch either filters or forwards it.
switch either filters or forwards it.
Packets with source and
destination addresses on the
same port segment are filtered
and constrained to one port so the
rest of the network doesn’t have to
process them. A packet that has a
destination address on another
same port segment are filtered
and constrained to one port so the
rest of the network doesn’t have to
process them. A packet that has a
destination address on another
port segment is forwarded to the
appropriate port. But packets that
you need for maintaining the
network’s operation—such as
occasional multicast packets—are
forwarded to all ports.
Frame buffering.
appropriate port. But packets that
you need for maintaining the
network’s operation—such as
occasional multicast packets—are
forwarded to all ports.
Frame buffering.
Because it’s a store-and-
forward switch, each frame (or
packet) is loaded into the switch’s
memory and inspected before
forwarding can occur. This way,
all forwarded frames are of a valid
length and have the correct CRC.
packet) is loaded into the switch’s
memory and inspected before
forwarding can occur. This way,
all forwarded frames are of a valid
length and have the correct CRC.
By eliminating the propagation
of bad packets, all of the available
bandwidth can be used for valid
information during peak traffic
times.
bandwidth can be used for valid
information during peak traffic
times.
The Hardened Ethernet
Switches dynamically allocate
buffer space from a 1-MB memory
pool to minimize the possibility of
dropping frames on congested
ports. This ensures that heavily used
ports receive very large buffer
space for packet storage. Allocation
of this sort enables the switch to
apply its resources to all traffic
loads, even when the traffic activity
is unbalanced across its ports.
buffer space from a 1-MB memory
pool to minimize the possibility of
dropping frames on congested
ports. This ensures that heavily used
ports receive very large buffer
space for packet storage. Allocation
of this sort enables the switch to
apply its resources to all traffic
loads, even when the traffic activity
is unbalanced across its ports.
Because network traffic
constantly varies in packet density
per port and in aggregate density,
the switch continually adapts
internally to provide maximum
network performance with the
least dropped packets.
Flow control.
the switch continually adapts
internally to provide maximum
network performance with the
least dropped packets.
Flow control.
Flow control kicks in when
the switch detects that its buffer
queue is losing space. It does this
by sending industry-standard (full-
duplex only) ”pause” packets to the
devices sending packets, thereby
temporarily stopping incoming
traffic until existing traffic can catch
up without dropping packets. This
flow control process is transparent
to the user.
queue is losing space. It does this
by sending industry-standard (full-
duplex only) ”pause” packets to the
devices sending packets, thereby
temporarily stopping incoming
traffic until existing traffic can catch
up without dropping packets. This
flow control process is transparent
to the user.
You also get a collision-based
flow-control mechanism. When
operating in at half-duplex, the
switch can prevent more frames
from entering a full buffer queue
by forcing a collision signal on all
receiving RJ-45 half-duplex ports.
operating in at half-duplex, the
switch can prevent more frames
from entering a full buffer queue
by forcing a collision signal on all
receiving RJ-45 half-duplex ports.
The Hardened Ethernet Switch,
with an address table capacity of
16K node addresses, is suitable for
use in large networks. When nodes
are added or removed or moved
from one segment to another, the
self-learning switch automatically
keeps up with node locations. In
addition, its address-aging algorithm
16K node addresses, is suitable for
use in large networks. When nodes
are added or removed or moved
from one segment to another, the
self-learning switch automatically
keeps up with node locations. In
addition, its address-aging algorithm
causes least-used addresses to
drop out in favor of ones that you
use frequently.
Monitor activity via LEDs.
drop out in favor of ones that you
use frequently.
Monitor activity via LEDs.
Plug-and-play, the Hardened
Ethernet Switch requires no
software configuration during
installation or for maintenance.
software configuration during
installation or for maintenance.
To monitor activity on the
switch, you simply view the LED
indicators on the unit’s top cover.
The LEDs conveniently indicate
operating status of all ports. There’s
a power ”on” (PWR) indicator, and
a self-test at power up. For each RJ-
45, there are link/activity (LK/ACT)
LEDs indicating traffic and speed,
and full-/half-duplex indicators (F/H).
The fiber ports have link/activity
(LK/ACT) indicators.
indicators on the unit’s top cover.
The LEDs conveniently indicate
operating status of all ports. There’s
a power ”on” (PWR) indicator, and
a self-test at power up. For each RJ-
45, there are link/activity (LK/ACT)
LEDs indicating traffic and speed,
and full-/half-duplex indicators (F/H).
The fiber ports have link/activity
(LK/ACT) indicators.