User`s guide

14(44)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 G
268/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
OPERATION
Two types of bus configurations for different
requirements are possible for the S-interface:
• point-to-multipoint - short passive bus
• point-to-multipoint - extended passive bus
Point-to-multipoint is a user access supporting more
than one logical data link ( usually one per ISDN
terminal ) by a single network termination.
The difference between a short passive bus and an
extended passive bus is on the one hand the line
length and on the other hand the location of the TEs
on the bus.
NOTE: For more information, see document
1531 - BDV 113 08 Uen
The following bearer services are supported at the
S-Interface:
Definition of "bearer":
A bearer is a type of telecommunication
service that provides the capability for the
transmission of signals between two
ISDN interfaces.
Circuit mode ( 64 kbps )
• Speech
• Unrestricted digital information
• Unrestricted digital information with tones/
announcements ( 7 kHz )
• 3.1 kHz audio
• Video
Packet mode through the B-channel ( 64 kbps )
General information concerning the numbering
plan of the S-interface
Each S-interface and each connected ISDN terminal
supporting its own MSN ( = Multiple Subscriber
Number ) require a directory number in the system.
These ISDN directory numbers will correspond to
route access numbers, normally used for trunk routes.
The S-Interface can only have one common directory
number assigned.
The TEs can have one or more MSN assigned
( depends on the terminal ).
Example:
4 route access numbers, corresponding to
1 S-interface => 1 common number
3 TE => 3 individual numbers = 3 MSN
The "individual number" = MSN for the second TE is
e.g.: 4738
The S-interface and all connected TEs use the same
trunks, e.g.: trunk numbers 700 and 701.
This means that the S-interface and all connected TEs
are assigned to the corresponding route numbers in
which these trunks (700 and 701) are included.
S-
interface
trunk numbers
700 and 701
1. B-channel
2. B-channel
common
4736
number
1st.
TE
2nd.
TE
3rd.
TE
individual numbers
4737 4738 4739