16(46)
Date Rev
DocumentnumberPrepared
Doc respons/Approved Checked Reference
1998-05-29
L
1531-BDV BS 101 01 Uen
INSTALLATION INSTRUCTION
Subject responsible
Note: at the end of each line a termination resistor
must be installed (e.g. in the last wall outlet).
The switch 1 selects the termination on the transmitter
interface and switch 2 selects the termination on the
receiver interface. Switches 3 and 4 enable remote
power feeding to ISDN terminals connected to a link.
When connected as S-interface switches 1...4 should
be set to ON.
Settings of the S-interface relevant on
board indices -3,-4,-5
DIP-switch position 418
Note: When selecting S- or T-interfaces start by
setting the T-interfaces using switches 4, 3, 2
and 1 in consecutive order then set the S-
interfaces starting with switches 1, 2, 3 and 4.
Settings of the S-interface
Choose with RASC the configuration of the interface:
Extended passive bus default setting
and Short passive bus.
Ranges on the interface
The BTU-B is equipped with the S/T Bus Interface Cir-
cuit eXtended (SBCX). This circuit offers the advan-
tage of covering a higher attenuation on cables.
The standard S/T-interface specification considers ca-
bles with 6,5 dB attenuation equivalent to about 1000m
cable length in single terminal configuration.
Using the S/T Bus Interface Circuit eXtended (SBCX)
up to13 dB line attenuation can be covered. The figure
below shows the ranges using standard 0.6 mm diam-
eter twisted pair unshielded cables with a capacitive
load of max. 30nF per km and the terminal equipment
(refer to documentation of the TE) is also equipped
with a SBCX or equivalent.
Short passive bus
Extended passive bus
Abbreviations:
TE Terminal Equipment
TR Termination Resistor (
installed at the end of the
interface line. Use outlets with resistor mounted
)
Outlet according to IEC 603-7 with termination
Outlet according to IEC 603-7 without termina-
tion
0 + 1
2 + 3
ON
3
21
4
4 + 5
6 + 7
Line pairs:
On factory delivery all switches are set to OFF
OFF... Q/T-Interface
ON ...S-Interface
When selecting which link is to be configured
Q/T-interface
S-interface
as a S-/Q-/T-interfaces start with switch:
BTU-B
TE TE
TE
TE TE TE
SBCX
TE
up to 500 m (standard range)
SBCX
1 km (standard range)
Ranges on the extended passive bus
and up to 1.5 km with
TEs equipped with SBCX
and up to 2 km with
TEs equipped with SBCX
d1
TE TE
d1 - 150m to 250m (standard range)
with TR
BTU-B
TE
d3
d4 - up to 1m
d4
in outlet
d3 - line to terminal up to 10m
d1
d2
TE
TE
d1 - up to 500m (standard range), d2 - between terminals
25 to 50 meters
BTU-B
1,5 km on 30 nF cables with
TEs equipped with SBCX
d3 - line to terminal up to 10m
d4 - up to 1m
d4
d3
with TR
TE
in outlet
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