tainy hmod-v3-io, tainy hmod-l3-io - Dr. Neuhaus ...

Small lexicon of routers
CSQ / RSSI The CSQ value is a value defined in the GSM standard for indicating the
signal quality. CSQ values correspond to the received field strength RSSI
(= Received Signal Strength Indication):
Datagram
CSQ RSSI
< 6 < -101 dBm
6 - 10 -101 … - 93 dBm
11 – 18 - 91 dBm … -77 dBm
> 18 > 75 dBm
99 Not logged in
In the transmission protocol TCP/IP, data are sent in the form of data
packets, the so-called IP datagrams. An IP datagram has the following
structure:
1. IP Header
2. TCP/UDP Header
3. Data (Payload)
The IP Header contains:
� the IP address of the sender (source IP address)
� the IP address of the recipient (destination IP address)
� the protocol number of the protocol of the next higher protocol layer
(according to the OSI layer model)
� the IP Header Checksum for checking the integrity of the header upon
receipt.
TCP/UDP Header contains the following information:
� the port of the sender (source port)
� the port of the recipient (destination port)
� a checksum for the TCP Header and a few items of information from
the IP Header (source and destination IP addresses, etc.
DES / 3DES The symmetric encryption algorithm (� symmetric encryption) DES,
originating from IBM and tested by the NSA, was established in 1997 by the
American National Bureau of Standards, the predecessor to today's National
Institute of Standards and Technology (NIST) as a standard for American
governmental institutions. Since it was the first standardised encryption
algorithm, it was also quickly adopted in industrial applications in the US and
beyond.
DES works with a key length of 56bit, which can no longer be considered to
be secure due to the increase in computing capability of the computer since
1977.
3DES is a variant of DES. It works with keys three times the size, which are
168 bits long. It is still considered to be secure and is also a part of the IPsec
standard, among other things.
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