
C H A P T E R 4
Cable Connections and Pin-outs 
This section describes the following topics:
•Unit 
•
•
•Circuit Switch Network Port, page 
•ISDN Port, page 
Unit RS-232  9-Pin  Serial Port
Table 
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| Pin | Function | I/O | |
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| 1 | NC | 
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| 2 | RXD | Input | |
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| 3 | TXD | Output | |
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| 4 | NC | 
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| 5 | GND | 
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| 6 | NC | 
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| 7 | NC | 
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| 8 | NC | 
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| 9 | NC | 
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Installation and Upgrade Guide for Cisco Unified Videoconferencing 3545 PRI Gateway and 3545 Serial Gateway Release 5.5
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