User Manual

Amosphere NPM Installation Procedures (MMDS)
146 Part 004071A revision 00b August 6, 2003
divides a geographic area into cells, each of which
has its own radio transmitters and receivers.
Competing digital cellular systems include GSM
and CDMA.
central office
A physical voice and data switching center, also
called the local exchange, where local loops are
connected to the core network.
CompactPCI
An open, industy-standard architecture based on
the PCI architecture. Electrically, CompactPCI is
superset of PCI. CompactPCI cards use Eurocard
form factors and are typically available in 3U and
6U formats.
The CompactPCI standard is controlled the PCI
Industrial Computer Manufactor’s Group
(PICMG).
core network
Generically, the physical infrastructure at the
center of a network with a single administrative
entity.
See also "network core".
D
dB (decibel)
A logarithmic expression of the ratio of two
electrical qualities. To calculate dB, use the
formula: S
db
= 10 log (P
2
/ P
1
). P represents
power, in watts.
E
E1 Package
A SOMA Networks document that provides
Amosphere installation and operation
instructions for a specific site.
Ethernet
A LAN protocol that uses CSMA/CD and a bus
topology to support data transfer at 10 Mbits/s.
A newer version, called Fast Ethernet or 100Base-
T, supports data transfer at 100 Mbits/s, and the
IEEE has developed a standard for so-called
Gigabit Ethernet (IEEE P802.3z).
Ethernet MAC address
A unique, 48-bit number programmed into every
LAN card, usually at the time of manufacture.
Destination and source MAC addresses are
contained in LAN packets and are used by bridges
to filter and forward packets.
G
gateway
A device that connects two networks together.
For example, gateways connect the network to the
PSTN and the Internet.
GPS (Global Positioning System)
A satellite-based system used to provide precise
terrestial and time information to devices
equipmented with a GPS receiver.
H
host
A computer on which operating software resides.
I
IF (intermediate frequency)
A radio signal that will be converted to a new
frequency prior to transmission.
IP (Internet Protocol)
The packet-transfer protocol used on the
Internet. IP specifies the format of the basic unit
of data, the datagram, and defines the addressing
scheme used for its transfer.
installation.book Page 146 Wednesday, August 6, 2003 6:06 PM