H3C Technologies H3C MSR 5600 - Manual (Page 10)

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• No service queuing because each POS terminal uses a dedicated line (except networks consisting
of POS concentrator and POS terminals).
Figure 2 Network diagram
In POS flow access mode, the following methods are available for connecting a POS terminal to the
router:
• Method 1—Directly connect the RS-232 interface of the POS terminal to the asynchronous interface
(including the synchronous/asynchronous interface in asynchronous mode) on the router. If the
connection distance is longer than 15 m (49.21 ft), you must equip each connection end with a
long-line-driver to extend the connection distance.
The operating distance of a pair of passive long-line-drivers is usually about 1200 m (3937.01 ft).
• Method 2—Use multiple POS terminals and a POS concentrator. Connect the RS-232 interface of
the POS concentrator to the asynchronous interface of the router.
The configurations for the egress interface of the router are the same for both methods. The second
method saves interface resources.
POS TCP access
This mode is applicable to Ethernet POS terminals. A POS terminal uses its Ethernet interface to connect
to the Ethernet interface of the router or the embedded switching module.
The POS TCP access mode has the following advantages:
• Long communication distance.
• Fast connection rate from POS terminals to the transaction center.
• Reduced workload on the FEP because not all POS terminals need to establish dedicated TCP/IP
connections to the FEP.