Cisco Systems 1900 Series Manual De Usuario

This document gives cable information and specifications for the console port, auxiliary port, and 
network ports on your Cisco 1900 series integrated services router.

The router includes USB, asynchronous serial and auxiliary ports. The console and auxiliary ports 
provide access to the router either locally using a console terminal connected to the console port, or 
remotely, using a modem connected to the auxiliary port. This section provides important cabling 
information to consider before connecting the router to a console terminal or modem.

The main difference between the console and auxiliary ports is that the auxiliary port supports flow 
control, whereas the console port does not. Flow control paces the transmission of data between a 
sending device and a receiving device. Flow control ensures that the receiving device can absorb the data 
sent to it before the sending device sends more. When the buffers on the receiving device are full, a 
message is sent to the sending device to suspend transmission until the data in the buffers has been 
processed. Because the auxiliary port supports flow control, it is ideally suited for use with the 
high-speed transmissions of a modem. Console terminals send data at slower speeds than modems; 
therefore, the console port is ideally suited for use with console terminals.

The router has an EIA/TIA-232 asynchronous serial console port (RJ-45) and at least one USB Type-A 
2.0 compliant ports. See 

 for a list of ports.