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100 CHAPTER 7: POS TERMINAL ACCESS SERVICE
implemented otherwise, the system will prompt as follows to indicate that the
configuration has failed:
App-state is wrong.
7 Set 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
Display and Debug
POS Access
Perform the following configuration in all views.
Table 79 Display and debug POS access
Operation Command
Set the parameters of FCM used
during Modem negotiation
pos-server fcm [ answertime time ] [
tradetime time ] [ packetinterval time ]
Restore the parameters of FCM
used during Modem negotiation
noundo pos-server fcm [answertime time ]
[tradetime time ] [ packetinterval time
]
Operation Command
Clear the counter of the displayed
information.
reset pos
Clear the number of times that negotiation
fails or the number of times of disconnection
due to transaction timeout to zero
reset fcm
Display the brief information of POS
application.
display pos-app
Display the brief information of POS interface display pos-interface
Display the number of times that negotiation
fails or the number of times of disconnection
due to transaction times out
display fcm
Enable the debugging of POS application debugging pos-app [ app-number ]