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The following cabling diagrams describe the pin-to-pin connections of cables used by the Cisco Metro 1500 series system.
The null modem cable wiring diagram in Table A-1 provides signaling between machines that allows you to use hardware RTS/CTS flow control.
| Pin Signal | Pin ------------------------------------------ Pin |
|---|---|
CD | 1 ------------------------------------------- 4 |
Rx Data | 2 ------------------------------------------- 3 |
Tx Data | 3 ------------------------------------------- 2 |
DTR | 4 ------------------------------------------- 1 |
Ground | 5 ------------------------------------------- 5 |
DSR | 6 |
RTS | 7 ------------------------------------------- 8 |
CTS | 8 ------------------------------------------- 7 |
RI | 9 ------------------------------------------- 9 |
The cables described in this section are used to interconnect systems either directly or through a network hub.
To find pin 1 on a 10BaseT plug, follow these steps:
Step 2 Turn the connector around so that the flat side is toward you and the plastic tag is away from you.
Step 3 Pin one is to your left, as shown in Figure A-1.
There is no specified color coding for cables under 10BaseT. Color coding for wiring under the EIA/TIA-568B standard is given for use with striped twisted pair. Whether you are using striped twisted pair or solid color twisted pair, follow the appropriate wiring diagrams in Table A-2 and Table A-3.
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Note It is important that wiring be done using twisted pairs. Pins 1 and 2 should be wired using one twisted pair and pins 3 and 6 should be wired using a second twisted pair. |
Straight-through cables are used in a star-based setup to connect systems to a hub. Table A-2 contains the cabling diagram for a straight through cable.
| Pinout | Striped Color | Solid Color |
Pin 1 (TD+) --------------------------- (TD+) Pin 1 | White/Orange | Green |
Pin 2 (TD-) ---------------------------- (TD-) Pin 2 | Orange | Yellow |
Pin 3 (RD+) --------------------------- (RD+) Pin 3 | White/Green | Blue |
Pin 4 --------(Not used by 10BaseT)------- Pin 4 | Blue | Red |
Pin 5 --------(Not used by 10BaseT)------- Pin 5 | White/Blue | Black |
Pin 6 (RD-) ---------------------------- (RD-) Pin 6 | Green | Orange |
Pin 7 --------(Not used by 10BaseT)------- Pin 7 | White/Brown | Brown |
Pin 8 --------(Not used by 10BaseT)------- Pin 8 | Brown | Grey |
Crossover or X cables are used to connect two systems directly together without using a hub. Crossover cables are also used to connect stacked 10BaseT hubs. Table A-3 contains the cabling diagram for a crossover cable.
| Pinout | Striped Color | Solid Color |
|---|---|---|
Pin 1 (TD+) --------------------------- (RD+) Pin 3 | White/Orange | Green |
Pin 2 (TD-) ---------------------------- (RD-) Pin 6 | Orange | Yellow |
Pin 3 (RD+) --------------------------- (TD+) Pin 1 | White/Green | Blue |
Pin 4 --------(Not used by 10BaseT)------- Pin 4 | Blue | Red |
Pin 5 --------(Not used by 10BaseT)------- Pin 5 | White/Blue | Black |
Pin 6 (RD-) ---------------------------- (TD-) Pin 2 | Green | Orange |
Pin 7 --------(Not used by 10BaseT)------- Pin 7 | White/Brown | Brown |
Pin 8 --------(Not used by 10BaseT)------- Pin 8 | Brown | Grey |
Table A-4 contains the cable specification for the twisted pair wore used in wiring the cables.
| Power | Cable Type | Category |
100 ohm1 | 4-pair unshielded/shielded twisted-pair (UTP/STP) | 3 to 5 |
150 ohm1 | 2-pair shielded twisted-pair (STP) | 3 to 5 |
Posted: Tue Jun 6 18:33:56 PDT 2000
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