ncr/doc/RealPOS/7455/Technical_Manuals/7455_Re... - Alsys Data

1-10 Chapter 1: Product Overview
Link Integrity is provided to the PC chipset to permit boot-up software
to verify the presence of the LAN connection. Software must allow 2
seconds after power-up for the Link Integrity signal to become valid.
Wireless LAN Communications
Where a wired Ethernet connection is not desired, a wireless LAN
adapter may be installed in the PCMCIA socket. This requires that the
PCMCIA daughterboard feature be installed. A wireless LAN used in
the terminal must meet the following requirements:
• Integrated antenna that meets the requirements of PCMCIA (PC
Card) Extended Type 2 card definition (a maximum of 5-cm
additional length).
• Power consumption within the capabilities of the PCMCIA
daughterboard.
• Signaling requirements within the capabilities of the terminal
PCMCIA interface. The main restriction is that DMA transactions
are not supported over the PCMCIA interface.
• Device drivers for the targeted operating system must exist.
• Appropriate infrastructure (server support, Base Stations, Ceiling
Antennas, etc) must be present in the installation site, and the
maximum RF range of the wireless system must not be exceeded.
Interoperability – While the 802.11 standard provides an interoperable
protocol definition, there are vendor-specific extensions to the protocol
that encourage users to stay with one supplier’s equipment. This also
applies to wireless infrastructure and access points; 802.11 does not
govern this operation. Mixing of RF suppliers on a site is not
recommended until the RF suppliers have demonstrated
interoperability.
Note: It is possible that other LAN PC cards may work; however,
NCR does not certify all configurations.
Remote Wakeup over the wireless network is not possible because the
cards do not support it. An alternative is to use the system real-time
clock wake-up at a scheduled time.