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Cisco MWR 1900 Mobile Wireless Edge Router Hardware Installation Guide
78-13982-02
Chapter 2 Preparing to Install the Router
Console and Auxiliary Port Considerations
Console and Auxiliary Port Considerations
The router includes an asynchronous serial console port and an auxiliary port. The console and auxiliary
ports provide access to the router either locally using a console terminal, or remotely using a modem
connected to the auxiliary port. This section discusses important cabling information to consider before
connecting a console terminal, which can be either an ASCII terminal or a PC running terminal
emulation software, to the console port or modem to the auxiliary port.
The main difference between the console and auxiliary ports is that the auxiliary port supports hardware
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.
Note Console and rollover cables are not included with the MWR 1900 router. You can order the
console cable from Cisco Systems (PN ACS-1900ASYN=). You must supply your own
rollover cable.
Console Port Connections
The router includes an EIA/TIA-232 asynchronous serial console port (RJ-45). Depending on the cable
and the adapter used, this port will appear as a data terminal equipment (DTE) or data communications
equipment (DCE) device at the end of the cable.
To connect an ASCII terminal to the console port, use the RJ-45 rollover 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 rollover 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 hardware flow control. For detailed information about
installing a console terminal, see the “Connecting the Console Terminal and Modem” section on
page 3-2.
For cable and port pinouts, see the online document Cisco Modular Access Router Cable Specifications.
This document is located on the Documentation CD-ROM that accompanied your router, and on
Cisco.com.
Auxiliary Port Connections
The router includes 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.
To connect a modem to the auxiliary port, use the RJ-45 rollover cable with the male RJ-45-to-DB-25
adapter (labeled MODEM). For detailed information about connecting devices to the auxiliary port, see
the “Connecting the Console Terminal and Modem” section on page 3-2.
For cable and port pinouts, see the online document Cisco Modular Access Router Cable Specifications.
This document is located on the Documentation CD-ROM that accompanied your router, and Cisco.com.