Technical data

A. Appendix to basepackage

A.1. Null Modem Cable

For using the otional package PPP (Page 185) a null modem cable is needed.

It needs at least three wires. This is the pin layout:

male- female- female- male-

pins pins

25pin 9pin 9pin 25pin

8 +- 1 1 -+ 8

| |

3 | 2 ------------\ /------------ 2 | 3

| X |

2 | 3 ------------/ \------------ 3 | 2

| |

20 +- 4 4 -+ 20

| |

7 | 5 --------------------------- 5 | 7

| |

6 +- 6 6 -+ 6

4 +- 7 7 -+ 4

| |

5 +- 8 8 -+ 5

The plugs have to be soldered with the bridges shown above.

A.2. Serial Console

ﬂi4l can be used without monitor and keyboard. A drawback of this setup is that eventual

error messages will not get noticed because not all messages can be piped to the syslog-port.

A possible solution is redirecting of all console messages to a PC or a classic terminal using

the serial port of the router. Conﬁguration is done by the variables SER_CONSOLE (Page 29),

SER_CONSOLE_IF (Page 29) and SER_CONSOLE_RATE (Page 29).

Machines with older mainboards/cards don not support higher serial speeds than 38400 Bd.

This is why you should try with a maximum of 38400 Bd at ﬁrst before testing higher port

speeds. Since only text messages are displayed on the console higher speeds are not evne

necessary.

All messages that usually would go to the console are now redirected to the serial port –

also messages of the boot process!

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