Operating Features
Stackable MiniHubs perform signal amplification, retiming of data packets, and regeneration of preamble bits for each packet received. They also detect collisions, extend collision fragments, and automatically partition and reconnect individual ports. This section describes a few of these features in greater detail.
Specifications
Standards — All:
Data Rate — 10 Mbps
Diagnostics — Via LEDs or network software
Indicators — (18)
(1) Power; (8) Link/TX (1 for each port);
(8) Pol/RX (1 for each port)
Leads/Signals Supported — Pins 1,
2, 3, and 6
Preamble Regeneration
As per Ethernet standards, the MiniHubs add bits to the preambles of output packets so that each output packet contains a minimum
Collision Condition
When carrier is detected simultaneously on multiple ports, a jam pattern is generated on each port to create a collision condition. When a collision signal from one port is detected, it generates a jam pattern to other ports.
Partitioning — Automatic after 32 consecutive collisions
Reconnection — Occurs after 512 bits of
Maximum Segment Length —
UTP: 328 ft. (100 m);
STP: 492 ft. (150 m);
AUI drop cable: 164 ft. (50 m);
BNC: 607 ft. (185 m);
10BASE5: 1640 ft. (500 m);
fiberoptic: 6562 ft. (2 km)
Connectors — All: (8) shielded
(2)stacking bus headers;
Partitioning and Reconnection
Stackable MiniHubs will automatically partition any port where 32 consecutive collisions occur or after 6.5 ms of continuous transmissions. Network integrity is checked every 800 ms, and the segment is reconnected after one
User Controls —
Stackable switch to specify which hub is at the base of the stack
Enclosure —
Cooling Method — Convection
MTBF — 50,000 hours
Temperature Tolerance — Operating: 32 to 122°F (0 to 50°C); Storage:
+60°C); Humidity: 10 to 95%,
noncondensing
Fragment Extension
The Stackable MiniHubs will automatically add bits to a received data packet of less than 96 bits (a ”fragment”) so that the size of the packet sent on toward its destination is at least 96 bits.
Power — From wallmount power supply: Input:
Size — 1"H x 6.8"W x 4"D (2.5 x 17.2 x 10.1 cm)
Weight — 1.3 lb. (0.6 kg);
With power supply: 2.3 lb. (1 kg)
The Complete Package
•(1) Stackable MiniHub
•(1) External 120-VAC, 60-Hz power supply
•(1) Velcro tape section, approximately 3 inches (7.6 cm) in length
•(2) Brackets for optional
•(1) User’s manual
•(1) Stacking cable
Ordering Information
ITEM | CODE |
Stackable MiniHub | LE2801A |
Stackable | |
Stackable |
