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V.24
2B+D
DCE
DCE-SOPHO-SET,
SOPHO-LAM or LAM
1
2B+D,( B=64kbps, user channel.
2
SOPHO-LAM P375 release 3 in DTE mode (!)
3
Special cable (See appendix C)
4
Modulated carrier.
Figure 3-4 Digital Connection to an Analogue Trunk with SOPHO-LAM Convertor (Leased
Line).
The DLC/DTX in this figure is one of the following boards:
-
a DLC-I;
-
a DTX-I;
-
a DLC-U/PNT1 (release 1 or 2) combination;
-
a DLC-A(B)/PNT1 (release 1 or 2) combination;
-
a DLC-C(D)/PNT1 (release 1 or 2) combination.
An important difference between the SOPHO-LAM convertor configuration and the MLU
convertor configuration is that the SOPHO-LAM configuration is projected as an extension
and thus acts like an extension (including all extension related facilities). So, the SOPHO-LAM
convertor has NOT to be defined as a kind of ATU.
In the convertor configuration the SOPHO-LAM must operate in the DTE mode. In this mode
a DCE (modem) can be connected to the V.24 port of the SOPHO-LAM. Normally the
SOPHO-LAM operates in the DCE mode. The SOPHO-LAM is set in the DTE-mode using a
special signalling group for projecting the DLC or DTX-I (see Appendix C). Note that a special
cable must be connected between the SOPHO-LAM and the modem (see appendix C).
Note that the leased line configuration can be used for both incoming and outgoing calls (call
setup direction). The convertor settings for both configurations are the same. The switched
line configuration can NOT be used for both directions of call setup (see section
Terminal Connected to a DLC/DTX
The following selection mechanisms can be used to select the SOPHO-LAM convertor:
1
SN
IMP
64 kbps
DLC/
DTX-I
(CONVERTORS)).
1
IMP
64 kbps
2B+D
DLC/
SOPHO-
DTX
LAM
MODEM
2
3
V.24
4
Analogue
Trunk
line
3.1.2. Data
31
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