Command Reference Guide

3Com Router 5000 Family and Router 6000 Family pos-server fcm ● 267
Command Reference
pos-server fcm
Purpose Use the pos-server fcm command to configure FCM parameters for modem
negotiation.
Use the undo pos-server fcm command to restore the defaults.
Syntax pos-server fcm { answertime time | tradetime time | packetinterval time }
undo pos-server fcm [ answertime ] [ tradetime ] [ packetinterval ]
Parameters answertime time
Maximum duration waiting for an answer (in
milliseconds). Valid values are 500 to 2000.
If no value is specified, the default is 500 milliseconds.
tradetime time
Maximum duration a transaction may last (in
milliseconds). Valid values are 30,000 to 12,000,000.
If no value is specified, the default is 60,000.
packetinterval time
Maximum duration waiting for an acknowledgement
(in milliseconds). Valid values are 3,500 to 10,000.
If no value is specified, the default is 5,000.
Default In normal cases, the defaults of these timers are adequate. When exceptions occur,
you may modify them as needed.
Example Set the answer timer to 800 milliseconds, trade timer to 1,200,000 milliseconds (20
minutes), and packet interval timer to 6000 milliseconds (6 seconds).
[Router] pos-server fcm answertime 800
[Router] pos-server fcm tradetime 1200000
[Router] pos-server fcm packetinterval 6000
View This command can be used in the following views:
■ System view
Description In a POS access application, the modem on the FCM module usually acts as the called
party, and the modem embedded in the POS terminal acts as the calling party. The
following is the communication process between the two parties:
■ The POS terminal originates a call.
■ When the called party detects the call signal, it switches to the off-hook status and
sends answer tone to the POS terminal.
■ After the POS terminal receives the answer tone, the two sides begin the modem
negotiation (V.22). To ensure a successful negotiation, you need to set the
duration of answer tone appropriately considering the differences of telephony
networks in signal quality and delay. For a system with a bad network condition, a