User guide

Glossary Canopy System User Guide
604
pmp-0229 (Mar 2013)
Data Encryption
Standard
Over-the-air link option that uses secret 56-bit keys and 8 parity bits.
Data Encryption Standard (DES) performs a series of bit permutations,
substitutions, and recombination operations on blocks of data.
Date of Last Transaction
A field in the data that the cmd show esn command generates from
data in the SQL database in the Bandwidth and Authentication
Manager (BAM) server. This field identifies the date of the most recent
authentication attempt by the SM. Expressed in the database output
as DLT.
Dell
A trademark of Dell, Inc.
Demilitarized Zone
Internet Protocol area outside of a firewall. Defined in RFC 2647. See
http://www.faqs.org/rfcs/rfc2647.html
.
DES
Data Encryption Standard. An over-the-air link option that uses secret
56-bit keys and 8 parity bits. DES performs a series of bit
permutations, substitutions, and recombination operations on blocks of
data.
Desensed
Received an undesired signal that was strong enough to make the
module insensitive to the desired signal.
DFS
See Dynamic Frequency Selection.
DHCP
Dynamic Host Configuration Protocol, defined in RFC 2131. Protocol
that enables a device to be assigned a new IP address and TCP/IP
parameters, including a default gateway, whenever the device reboots.
Thus DHCP reduces configuration time, conserves IP addresses, and
allows modules to be moved to a different network within the system.
See http://www.faqs.org/rfcs/rfc2131.html
. See also Static IP Address
Assignment.
Diffraction
Partial obstruction of a signal. Typically diffraction attenuates a signal
so much that the link is unacceptable. However, in some instances
where the obstruction is very close to the receiver, the link may be
acceptable.
DiffServ
Differentiated Services, consistent with RFC 2474. A byte in the type
of service (TOS) field of packets whose values correlates to the
channel on which the packet should be sent. The value is a numeric
code point. Cambium modules map each of 64 code points to values
of 0 through 7. Three of these code points have fixed values, and the
remaining 61 are settable. Values of 0 through 3 map to the low-
priority channel; 4 through 7 to the high-priority channel. The
mappings are the same as 802.1p VLAN priorities. (However,
configuring DiffServ does not automatically enable the VLAN feature.)
Among the settable parameters, the values are set in the AP for all
downlinks within the sector and in the SM for each uplink.
Disable
To turn off a feature in the module after both the feature activation file
has activated the module to use the feature and the operator has
enabled the feature in the module. See also Activate and Enable.