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This appendix provides the technical specifications (see Table A-1) and connector pinouts of the switch.
Table A-1 : Technical Specifications
| Specification | Catalyst 1900 | Catalyst 2820 |
| Reliability | 50,000 hours MTBF | 50,000 hours MTBF |
| Operating temperature | 32--104°F (0--40°C) | 32--104°F (0--40°C) |
| Operating humidity | 10--90% | 10--90% |
| Operating altitude | Up to 10,000 ft (3050 m) | Up to 10,000 ft (3050 m) |
| Power consumption | 65W | 110W |
| Input voltage | 90--250V, 50--60 Hz | 90--250V, 50--60 Hz |
| Weight | 10.5 lb (4.78 kg) | 13 lb (5.90 kg) |
| Width | 17.5 in. (44.45 cm) | 17.5 in. (44.45 cm) |
| Depth | 15.3 in. (38.86 cm) | 12.4 in. (31.50 cm) |
| Height | 1.73 in. (4.39 cm) | 3.34 in. (8.76 cm) |
This section describes the following connectors used by the switch:
Ports 1 through 25 use standard RJ-45 connectors and 10BaseT pinouts with internal cross-overs, as indicated by an X. These 10BaseT ports have their transmit (TD) and receive (RD) signals internally crossed, for attachment of an adapter using a straight-through cable. Figure A-1 shows the pinout.
Figure A-1 : 10BaseT Pinout and Connector (Crossed Port)
100BaseTX ports use an RJ-45 connector and pinout equivalent to the one shown in Figure A-1.
The AUI connector is a 15-pin female receptacle, as shown in Figure A-2 and described in Table A-2.
Figure A-2 : AUI Connector
Table A-2 : AUI Connector Pinouts
| 1 | GND | Ground |
| 2 | CI+ | Positive AUI differential collision-data input |
| 3 | TX+ | Positive AUI differential transmit-data input |
| 4 | GND | Ground |
| 5 | RX+ | Positive AUI differential receive-data output |
| 6 | GND | Ground |
| 7 | NC | |
| 8 | GND | Ground |
| 9 | CI- | Negative AUI differential collision data |
| 10 | TX- | Negative AUI differential transmit-data input |
| 11 | GND | Ground |
| 12 | RX- | Negative AUI differential receive data output |
| 13 | +12V | 12V supply for external MAU |
| 14 | GND | Ground |
| 15 | NC |
The serial connector is a male 9-pin D-Sub connector, as shown in Figure A-3.
The pinouts are shown in Table A-3.
Table A-3 : Serial Connector Pinouts
| 1 | DCD |
| 2 | RD |
| 3 | TD |
| 4 | DTR |
| 5 | GND |
| 6 | DSR |
| 7 | RTS |
| 8 | CTS |
| 9 | RI |
The shell is connected to the chassis ground. Use a standard modem cable to connect to a modem. Use a null-modem cable to connect to a terminal.
Either piece of equipment can come with either 9- or 25-pin connectors, as shown in Figure A-4 and Figure A-5.
Figure A-4 : Modem Cable Schematic with 9- and 25-Pin Devices
Figure A-5 : Null-Modem Cable Schematic with 9- and 25-Pin Devices
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