3Com 10014299 manual Display and Debug POS Access, Display and debug POS access

100CHAPTER 7: POS TERMINAL ACCESS SERVICE

implemented otherwise, the system will prompt as follows to indicate that the configuration has failed: App-state is wrong.

7Set the parameters of FCM used during Modem negotiation

In the POS access application, the Modem on the FCM card usually acts as the called party, and the Modem embedded in the POS terminal acts as the calling party. In the Modem communication, the POS terminal originates a call after the called party detects the calling signal, it will answer and send an answer tone to the POS terminal. After the POS terminal receives answer tone, both sides begin the Modem negotiation (V.22). For a system with poor network quality, the short answer tone may cause Modem negotiation failure. On the router, in the case that you can see a constant UP and DOWN on the Modem port, without data being transmitted or received, just enlarge the value of ANSWERTIME.

After the negotiation reached, communication begins. The POS terminal adopts SDLC protocol, and the retransmission mechanism is used between the monitoring frame and the data frame to deal with abnormal occasions. The parameter PACKET INTERVAL is used to set the timeout value. For big packets (greater than 512 bytes), the system should enlarge the timeout value.

To improve the utilization of the POS access port, and to avoid a POS terminal being occupied for a long time, it is necessary to manage individual transaction times through configuring the parameter TRADETIME. If the maximum transaction time is exceeded after the POS terminal is dialed, the router will disconnect to unblock the resource.

In general, the default values of the parameters can satisfy the demands of application, but in abnormal occasions you need to modify some parameters.

Please perform the following configurations in system view.

Table 78 Set the parameters of FCM used during Modem negotiation

Operation	Command
Set the parameters of FCM used	pos-server fcm [ answertime time ] [
during Modem negotiation	tradetime time ] [ packetinterval time ]
Restore the parameters of FCM	noundo pos-server fcm [answertime time ]
used during Modem negotiation	[tradetime time ] [ packetinterval time
	]

Display and Debug POS Access

Perform the following configuration in all views.

Table 79 Display and debug POS access

Operation	Command
Clear the counter of the displayed	reset pos
information.
Clear the number of times that negotiation	reset fcm
fails or the number of times of disconnection
due to transaction timeout to zero
Display the brief information of POS	display pos-app
application.
Display the brief information of POS interface	display pos-interface
Display the number of times that negotiation	display fcm
fails or the number of times of disconnection
due to transaction times out
Enable the debugging of POS application	debugging pos-app [ app-number]