Cisco 2525 Preparazione all'installazione - Pagina 16

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Preparing to Connect to a Network

The main difference between the console and auxiliary ports is that the auxiliary port

supports flow control and 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 transmit at slower speeds than modems; therefore, the console

port is ideally suited for use with console terminals.

Console Port Connections

Both routers include an EIA/TIA-232 asynchronous serial console port (RJ-45). Depending

on the cable and the adapter used, this port will appear as a DTE or DCE device at the end

of the cable. Your router comes with cables and adapters to connect a console terminal (an

ASCII terminal or PC running terminal emulation software) to the console port. To connect

an ASCII terminal to the console port, use the RJ-45 roll-over cable with the female

RJ-45-to-DB-25 adapter (labeled Terminal). To connect a PC running terminal emulation

software to the console port, use the RJ-45 roll-over cable with the female RJ-45-to-DB-9

adapter (labeled Terminal). The default parameters for the console port are 9600 baud,

8 data bits, no parity, and 2 stop bits. The console port does not support flow control. For

detailed information about installing a console terminal, see the section "Connecting to the

Console Port" in the chapter "Installing the Cisco 2524 and Cisco 2525 Routers." See the

appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525 Routers" for cable

and port pinouts.

Both routers include an EIA/TIA-232 asynchronous serial auxiliary port (RJ-45) that

supports flow control. Depending on the cable and the adapter used, this port will appear as

a DTE or DCE device at the end of the cable. Your router comes with a cable and an adapter

to connect a modem to the auxiliary port. To connect a modem to the auxiliary port, use the

RJ-45 roll-over cable with the male RJ-45-to-DB-25 adapter (labeled Modem). For detailed

information about connecting devices to the auxiliary port, see the section "Connecting the

Console Terminal and Modem" in the chapter "Installing the Cisco 2524 and Cisco 2525

Routers." See the appendix "Cabling Specifications for the Cisco 2524 and Cisco 2525

Routers" for cable and port pinouts.

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