
38 FSU 5622 ESP User Manual 61200.175L1-1
Chapter 4. Applications
Internal Calls
When the telephone set on a remote FSU 5622 ESP is taken off-
hook, the local FSU 5622 ESP generates dial tone and waits for
the four-digit extension to be entered. Once the extension is
entered, the remote FSU 5622 ESP transmits this information to
the host FSU 5622 ESP where it is compared to extension infor-
mation in the extension/DLCI table. If the extension if found in
the extension/DLCI table, then the call is routed to the appropri-
ate extension via the host unit. When the called unit goes off-
hook, the data link is established and remains up until one of the
two extensions terminates the call.
PBX
FSU 5622
FRAME
RELAY
FSU 5622
RD1
TD2
RD2
TDN RDN
TD1
ALM
/TST
1
A
C
B
4
D
F
E
SHIFT
DELETE
QUICK
NEXT
PREV
ADD
7
2
5
#
3
6
9
8
0
FSU 5622
FSU 5622
RD1
TD2
RD2
TDN RDN
TD1
ALM
/TST
1
A
C
B
4
D
F
E
SHIFT
DELETE
QUICK
NEXT
PREV
ADD
7
2
5
#
3
6
9
8
0
FSU 5622
FXO
FSU 5622
RD1
TD2
RD2
TDN RDN
TD1
ALM
/TST
1
A
C
B
4
D
F
E
SHIFT
DELETE
QUICK
NEXT
PREV
ADD
7
2
5
#
3
6
9
8
0
FSU 5622
FSU 5622
RD1
TD2
RD2
TDN RDN
TD1
ALM
/TST
1
A
C
B
4
D
F
E
SHIFT
DELETE
QUICK
NEXT
PREV
ADD
7
2
5
#
3
6
9
8
0
FSU 5622
Remote #2
DLCI= 200
Remote #1
DLCI= 100
Remote #4
DLCI= 400
Remote #3
DLCI= 300
FSU 5622
RD1
TD2
RD2
TDN RDN
TD1
ALM
/TST
1
A
C
B
4
D
F
E
SHIFT
DELETE
QUICK
NEXT
PREV
ADD
7
2
5
#
3
6
9
8
0
EXT. 1000
EXT. 1001
EXT. 1002
EXT. 1003
EXT. 1004
EXT. 1005
EXT. 1006
EXT. 1007
FXS
FXS
FXS
FXS
Mode=Switched
Host/Remote=Remote
Mode=Switched
Host/Remote=Host
L1 Ext
1000
1002
1004
1006
L2 Ext
1001
1003
1005
1007
DLCI
100
200
300
400
Figure 4-7
Switched Mode Application
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