Chapter 1 General Information
MX-2100/2104
Installation and Operation Manual
1-26 Application Considerations
HOST
PABX
KML A
KML B
MX-2100
Central Site
KC
L
KD
I
Remote Site A
Remote Site B
MX-2104
MX-2104
PABX
KVF.4 1
PABX
KVF.4
1
KVF.4
5
KVF.4
3
KVF.4
6
KHS.1
4
KHS.1
7
1
KVF.4 2
KVF.4 3
KHS.1 4
KVF.4 5
KVF.4 2
KVF.4 6
KHS.1 7
Figure 1-15. Typical Bypassing Application
Channels that are not bypassed are connected to users connected to MX-2100 at
the central site: for example, the two channels of the KVF.4 module at location A
(identified by No. 3) are connected to the channels of the KVF.4 module also
identified by No. 3 which is installed at the central site, and the KHS.1 module at
location B (identified by No. 7) is connected to the KHS.1 module at the central
site.
Fully digital transmission for bypassing voice channels is an essential requirement
to the preservation of high-quality voice reproduction when low bit rate voice
compression is used, because it eliminates back-to-back analog interconnections at
intermediate locations, and the ensuing analog-to-digital and digital-to-analog
conversions. Full digital transmission has significant advantages for data channels as
well, because it does away with the cables that would otherwise be required for
the connection of data channels, and provides the equivalent of an electronic
cross-connect function (programmable by the same means used to control the
operation of MX-2100).
Multidrop Configurations
The KDI/M module version includes a data channel interface for multidrop
configurations. The multidrop channel is compatible with the data channels of the
KLS.1/NEW low-speed data module, and supports data rates in the range of 0.3 to
64 kbps.
As is standard practice in a multidrop application, the receive path of the local
multidrop channel continuously receives the traffic carried in the allocated
bandwidth on the desired main link, e.g., link A, and in addition the same data is
also bypassed to the other link, to make it available downstream. The transmit
path of the multidrop channel is connected to main link A only when the RTS line
in the local interface is asserted. A typical bypassing and multidrop configuration is
shown in