Innovaphone IP1200, Руководство администратора

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Page 82 innovaphone gateway
receive line.
B
BRI
The basic access (BA), also referred to as the BRI interface ( B asic R ate
I nterface), is the standard access to the ISDN ( I ntegrated S ervices D igital
N etwork). A basic access offers two speech/data channels (B channels,
derived from “bearer”) each at 64 kbit/s and a signalling channel (D
channel, derived from “data”) at 16 kbit/s. The net bandwidth is: 2 × 64
kbit/s + 16 kbit/s = 144 kbit/s. The basic access is used mainly by private
customers or smaller businesses; larger companies with a high level of
telephone activity use the primary multiplex access.
Broadcast
A broadcast transmission is simultaneous transmission from a single point to
all subscribers. In order to address particular classes of receivers or all
connected stations simultaneously in a network, the possibilities of multicast
or broadcast exist. In local networks, a broadcast is a message that is sent
to all devices in all networks. It is forwarded by every router to all connected
networks. If all terminals in a particular network are to be addressed, one
refers to multicast or network broadcast.
C
CCFP
CCFP ( C entral C ontroller F ixed P art) is a unit that controls all base stations.
Previously (with the ip1500), the DECT base stations were connected via a
proprietary interface with the CCFP using 2-wire cable.
With the IP1200, the DECT base stations are connected via IP with the CCFP
interface. Every IP1200 has a DECT base station and a control unit. In a
multicell
installation, only one control unit of an IP1200 is used (also known
as the IP master). All other DECT radios are controlled by it. The DECT radio
in this master IP1200 can be used (usually it is used as a normal DECT
radio; only if the IP DECT system uses more than 64 base stations, should