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This appendix provides system, cabling, and port wiring specifications and regulatory agency approvals for the hub. Table B-1 lists the system specifications for the hub, and Table B-2 lists the agency approvals.
| Description | Specification |
|---|---|
| Environmental Ranges | |
| -13 to 158°F (-25 to 70°C) |
| 0 to 90%, noncondensing |
| up to 30,000 ft (9146 m) |
| 32 to 113°F (0 to 40°C) |
0 to 85%, noncondensing | |
| up to 9840 ft (3000 m) |
| Power Requirements | |
| 100 to 127 VAC, 200 to 240 VAC |
| 20W |
| Physical Dimensions |
|
| 3.1 x 11.2 x 8.7 in. (7.9 x 28.5 x 22.1 cm) |
| 3.0 lb (1.4 kg) |
| Safety | EMI |
| FCC Part 15 Class B |
| EN 55022B Class B (CISPR 22 Class B) |
| VCCI Class B |
AS/NRZ 3548 Class B |
Table B-3 contains wiring specifications for the eight hub ports.
| 8 Pin1 | Description |
|---|---|
1 | RX+ |
2 | RX- |
3 | TX+ |
6 | TX- |
| 1Pins 4, 5, 7, and 8 are not used. |
This section contains wiring specifications, types, and limits of 10BaseT and 100BaseT Ethernet cable.
A crossover cable is used to connect two standard MDI-X ports when connecting two hubs or a hub and a switch together. When the Micro Hub MDI/MDI-X button is OUT, port 5 is an MDI-X port like any other port on the hub. When the Micro Hub MDI/MDI-X button is IN, port 5 is then similar to a port adapter, and you can use a standard straight-through cable between hubs.
Table B-4 describes the wiring for the straight-through 10BaseT and 100BaseTX Ethernet cable. Table B-5 describes the wiring for the crossover 10BaseT and 100BaseTX Ethernet cable.
| RJ-45 (from Network Device) Pin | Signal | Direction | RJ-45 (from Hub) Pin |
|---|---|---|---|
1 | RX+ | ---> | 1 |
2 | RX- | ---> | 2 |
3 | TX+ | <--- | 3 |
4 | - | - | 4 |
5 | - | - | 5 |
6 | TX- | <--- | 6 |
7 | - | - | 7 |
8 | - | - | 8 |
| RJ-45 (from Network Device) Pin1 | Signal | Direction | RJ-45 (from Hub) Pin |
|---|---|---|---|
1 | RX+ | ---> | 3 |
2 | RX- | ---> | 6 |
3 | TX+ | <--- | 1 |
4 | - |
| - |
5 | - |
| - |
6 | TX- | <--- | 2 |
7 | - |
| - |
8 | - |
| - |
| 1Incorrectly connected unused wires generate noise on long lengths. |
This section provides two examples of using the Micro Hub in simple network configurations, as specified in the IEEE 802.3u standard. These configurations were designed to satisfy the requirements of most networks that are built to the EIA/TIA-568 wiring standard. This standard specifies 100-meter Category 5 cable connections from wiring closets to desktops.
With only Category 5 cable segments, the maximum length for any cable segment is 100 meters, as shown in Figure B-1.
When stations are connected to the Micro Hubs with 100-meter Category 5 UTP cable segments, the Category 5 cable connecting the two Micro Hubs is limited to a distance of 5 meters, as shown in Figure B-2. This configuration can have up to 14 connected stations.
Posted: Tue Jul 18 10:53:50 PDT 2000
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