ZyXEL ES-3148 Guida Utente

 Chapter 38 Product Specifications

ES-3148 User’s Guide

In a serial communications connection, generally a computer is DTE (Data Terminal 
Equipment) and a modem is DCE (Data Circuit-terminating Equipment). The Switch is DCE 
when you connect a computer to the console port. The Switch is DTE when you connect a 
modem to the dial backup port.

3

Figure 164   Console/Dial Backup Port Pin Layout 

 

3.

 Pins 2,3 and 5 are used.

Table 122   Console/Dial Backup Port Pin Assignments

CONSOLE Port RS – 232 (Female) DB-9F

DIAL BACKUP RS – 232 (Male) DB-9M (Not on all 

models) 

Pin 1 = NON
Pin 2 = DCE-TXD
Pin 3 = DCE –RXD
Pin 4 = DCE –DSR
Pin 5 = GND
Pin 6 = DCE –DTR
Pin 7 = DCE –CTS
Pin 8 = DCE –RTS
PIN 9 = NON

Pin 1 = NON
Pin 2 = DTE-RXD
Pin 3 = DTE-TXD
Pin 4 = DTE-DTR
Pin 5 = GND
Pin 6 = DTE-DSR
Pin 7 = DTE-RTS
Pin 8 = DTE-CTS
PIN 9 = NON.

The CON/AUX port also has these pin 

assignments. The CON/AUX switch changes 

the setting in the firmware only and does not 

change the CON/AUX port’s pin assignments.

Switchs with a CON/AUX port also have a 9-pin 

adaptor for the console cable with these pin 

assignments on the male end.

Table 123   Ethernet Cable Pin Assignments

(Switch)

(Adapter) (Switch)

(Switch)

Pin 1

Pin 5

Pin 6

Pin 9