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9XTend ‐ PKG ‐ E? ? Ethernet ? RF ? Modem ? – ? Product ? Manual ? v2.x4x ? [2007.01.04]
5.1. Addressing
Each RF packet contains addressing information that is used to filter incoming RF data. Receiving
modules inspect the Hopping Channel (HP parameter), Vendor Identification Number (ID parame-
ter) and Destination Address (DT parameter) contained in each RF packet. Data that does not pass
through all three network security layers is discarded.
Figure ? 5 ‐ 01. Addressing ? layers ? contained ? in ? the ? RF ? packet ? header
5.1.1. Address Recognition
Transmissions can be addressed to a specific modem or group of modems using the DT (Destina-
tion Address) and MK (Address Mask) commands. A receiving modem will only accept a packet if it
determines the packet is addressed to it, either as a global or local packet. The receiving modem
makes this determination by inspecting the destination address of the packet and comparing it to
its own address and address mask [refer to the figure below].
Figure ? 5 ‐ 02. Address ? Recognition ? (@ ? the ? Receiving ? RF ? Modem)
TX_DT ? = ? Destination ? Address ? of ? transmitting ? modem
RX_DT ? = ? Destination ? Address ? of ? receiving ? modem
RX_MK ? = ? Address ? Mask ? of ? receiving ? modem
RX_MY ? = ? Source ? Address ? of ? receiving ? modem ?
The transmitting modem determines whether the packet is intended for a specific node (local
address) or multiple nodes (global address) by comparing the packet's destination address (DT)
and its own address mask (MK) [refer to the figure below]. It is assumed that the address masks
on the transmitting modem and receiving modem have been programmed to the same value for
proper operation in each RF Communication Mode.
Figure ? 5 ‐ 03. Address ? Recognition ? (@ ? the ? Transmitting ? RF ? Modem)
? ? 2007 ? MaxStream, ? Inc., ? Confidential ? & ? Proprietary ?‐? All ? Rights ? Reserved ?
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