Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 65)

4-5

Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note

OL-3008-01

Chapter 4 Configuring the Data Interfaces

Configuring Asynchronous/Synchronous Serial Interfaces

To configure the serial interfaces, perform these steps:

Command Purpose

Step 1

gateway> enable

Password: <password>

gateway#

Enter enable mode.

Enter the password.

You know you have entered enable mode when the prompt

changes to

gateway#.

Step 2

gateway# configure terminal

Enter configuration commands, one

per line. End with Ctrl-Z.

gateway(config)#

Enter global configuration mode.

You know you have entered global configuration mode

when the prompt changes to

gateway(config)#.

Step 3

gateway(config)# ip routing

Enable routing protocols as required for your global

configuration.

Step 4

gateway(config)# interface serial

1/0

gateway(config-if)#

Enter the interface configuration mode.

You know you have entered interface configuration mode

when the prompt changes to

gateway(config-if)#.

Step 5

gateway(config-if)# ip address

172.16.74.1 255.255.255.0

Assign the IP address and subnet mask to the interface.

Note All serial ports are initially configured as

synchronous.

Step 6

gateway(config-if)# clock rate 7200 To use a port in Data Communication Equipment (DCE)

mode, connect a DCE cable and set the internal transmit

clock signal (TXC) speed in bits per second. (For ports used

in Data Terminal Equipment (DTE) mode, the AGM

automatically uses the external timing signal.)

Step 7

gateway(config-if)#

dce-terminal-timing-enable

When a port is operating in DCE mode, the default

operation is for the DCE to send serial clock transmit (SCT)

and serial clock receive (SCR) clock signals to the DTE, and

for the DTE to return an serial clock transmit external

(SCTE) signal to the DCE.

If the DTE does not return an SCTE signal, enter this

command to configure the DCE port to use its own clock

signal.

Step 8

gateway(config-if)# invert-txcclock

An AGM that uses long cables might experience high error

rates when operating at higher transmission speeds, because

the clock and data signals can shift out of phase.

If a DCE port is reporting a high number of error packets,

you can often correct the shift by inverting the clock using

this command.

Step 9

gateway(config-if)# nrzi-encoding

All serial interfaces support both nonreturn to zero (NRZ)

and nonreturn to zero inverted (NRZI) formats. NRZ is the

default; NRZI is commonly used with EIA/TIA-232

connections in IBM environments. To enable NRZI

encoding on an interface, enter this command.

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