Black Box MWU2000-X21 - Manual (Page 122)

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2.048Mbps Wireless Modem
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Table C-2 summarizes the possible connections and the resulting behaviour:
Table C-2. Fractional E1/T1 Connections
In addition to the faults mentioned in the above table, there is a possibility of a cable being
disconnected or shortened. Both these situations usually result in LOS indication either by the
2.048Mbps Wireless Modem or by the end equipment.
Fractional E1 LIU Jumper Settings
The Fractional E1 LIU default setting is balanced, unless a Fractional E1 unbalanced
configuration is specified. The following diagrams show the jumper configurations on the
Fractional E1 LIU board for each configuration option.