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W i n d o w s
P C
S o f t w a r e
ATTENTION
P A GE 3 4
4.9.1.2
MSN Settings (Multiple Subscriber Number)
MSN usage
MSN is used for addressing a particular unit on the ISDN Bus, which allows
the operation of up to 8 units in parallel.
!
If only one unit is connected the entry of MSN is normally not necessary.
FIG. 14
If an MSN has to be used, enter it in the MSN-1 field. Per S
MSNs can be entered.
NOTE
With MSN the B channel of an ISDN connection cannot be addressed.
Use of the field MSN-2 is intended for a redundant system. For security as-
pects many radio stations have a second studio that is completely identical to
the first one. In case of a fault, calls can be switched immediately to the second
studio. In general the switching to another ISDN number is quite difficult, but
the Hybrid offers the possibility of choosing another MSN via a TTL operating
signal.
For this, in principal two Hybrids are operated on the same ISDN Bus. There-
fore without an MSN entry, both Hybrids would signal one caller. To always
make sure that only one Hybrid is active, both systems must have a vaild
number in MSN-1. In MSN-2 in both systems, enter an invalid number (e.g.
1111111). On both systems, connect pins 1 and 5 of the USER IO interface as
shown in Fig. 15. When switching over, one system now gets the valid MSN-1
block and the other one gets the invalid MSN-2 block. Thus always, only one
system is active.
SYSTEM CONFIGURATION TAP MSN SETTINGS
connection, two
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