![](/images/new-backgrounds/1188913/188913437x1.webp)
External Serial Port (“Console”)
| Circuit | Function | Direction |
Modular Jack |
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1 | CC | Data Set Ready | Inbound |
2 | CF | Carrier Detect | Inbound |
3 | CD | Data Terminal Ready | Outbound |
4 | AB | Signal Ground | ⎯ |
5 | BB | Receive Data | Inbound |
6 | BA | Transmit Data | Outbound |
7 | CB | Clear to Send | Inbound |
8 | CA | Request to Send | Outbound |
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Electrical specification: |
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| Connectors: |
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| Amp | ||
Configuration: |
| DTE |
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Transmission method: | Unbalanced | |||
Transmission rate: |
| 57.6 Kbps maximum | ||
Serial Port Cable (DCE) Specifications |
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| Using Adapter* | Function at NIC | ||
| Modular Jack |
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| 6 | 2 | 3 | Transmit Data |
| 5 | 3 | 2 | Receive Data |
| 8 | 4 | 5 | Request to Send |
| 7 | 5 | 4 | Clear to Send |
| 1 | 6 | 20 | Data Set Ready |
| 4 | 7 | 7 | Signal Ground |
| 2 | 8 | 20 | Carrier Detect |
| 3 | 20 | 6, 8 | Data Terminal Ready |
| N/C | − | N/C | Ring Indicate |
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N/C indicates Not Connected
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Wire type: | Belden 9538 or equivalent, 8 |
| conductor, shielded |
Maximum cable distance: | 50 feet, 15 meters |
Cabling: | |
| (IBM AT |