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Operating Modes and Character Recognition
Note
The test operating modes are not suitable for continuous operation since data
transmission between two DTEs is not possible using these modes.
The following pages contain detailed descriptions of the individual test operating
modes and some examples of their application.
Possible Error Causes
There are several causes, if the result of a level measurement or function test is
negativ. Some of the possible causes are:
· Wrong configuration of one or more MD2 modems that are connected to the
dedicated line network.
Remedy: Set the DIL switches, that can be accessed on the MD2 from above
and from below, correctly (baud rate, 2-wire/4-wire, terminating resistor,
RS232/RS485 port, operating mode, etc.).
· Attenuation to high.
For the maximum distance that can be covered: see chapter 2, section 2.2.6
Maximum range.
Remedy:
- Reduction of the transmissionspeed and/or
- Insertion of a repeater at the appropriate point in the dedicated line.
· Cable breakage.
· Wrong core pair:
At the beginning of the line the modem was connected to core pair x, at the
other end to core pair y.
· Wrong cores:
2 cores from different core pairs are used:
one core from core pair x, one core from core pair y.
Note: Maybe the interchange of the cores has not been made at the beginning
or end of the cable but took place somewhere in the line in a cable junction box.
· Cable damage:
Cable isolation defective, earth fault, water penetration, etc.
· Crosstalk in the cable.
· etc.
6NH7811-0AA22
4-10
© Siemens AG 2002 All Rights Reserved
MD2 Modem (07/2002)
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