26
BG 805 981 BE (0201) QMG422.oi
On the QC 422 check the setting of jumper X20 and correct it, if necessary.
Installation/removal of QC 422 (
→
).
X20 determines the
Transmission power
, it is determined by the
receiver of the
remote station
and the type of fiber-optic (FO) conductor..
The factory default setting
medium
provides a broad compatibility range when old
and new FO modules are mixed.
Procedure:
Determine the length and type of the FO conductor (glass fiber PCF or plastic fiber
APF).
Determine the FO module types to be interconnected:
Modules with serial number: ....W.... or higher (“W“ is increased annually) are
equipped with the new FO module type (applies to all component types)
In case of doubt (e.g. after a module has been replaced) open the unit and
read off the FO module type, that is, No. TODX 29? on the FO connector.
This is necessary because the receivers of earlier LAN modules can be overdriven
in short distances, with the new modules this is no longer the case.
Set jumper X20 on the
transmitter side
as shown in the table and the diagram:
Setting
X20
New FO module
TODX 296
Old FO module
TODX 294
Old PC interface
with SMA
connectors
short
0...500 (0...1.4) m
0...150 (0...1.2) m
not allowed
medium *)
0...750 (0...2.2) m
0...400 (0...2.0) m
0...50 m
long
0...1000 (0...3.0) m
400...700 (0...3.0) m
0...300 m
These values apply to PCF glass fibers, the values in (...) for APF plastic fibers.
*) Factory setting
X20
3
4
2
1
1
2
3
4
X20
medium
1
2
3
4
X20
1
2
3
4
X20
short
In case of transmission problems test the
adjacent setting in order to compensate
possible atypical attenuation of the FO
conductor.
Install the PC interface board into the PC according to its Operating manual.
Remove the protective caps from the fiber optic connectors and establish the fiber
optic link.
Do not kink the fiber
optic conductor. The
minimum bending radius
is 15 mm
4.8 LAN interface
Configuring the transmission
distance
Cabling PC-QMG