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OM20 Universal Outdoor Modem
ROM maps are read-only and may not be modified (refer to Table E-2).
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Since the D&I Functions are separate and distinct, two separate maps must be configured at the
start of the D&I Multiplexer Operation. These are the Tx (transmit) Active Map for Drop
Mapping and the Rx (receive) Active Map for Insert Mapping. Each map entry consists of an IBS
Time Slot assignment and the Terrestrial (T1 or E1) Channel Number to which it is assigned.
Drop Mapping and Insert Mapping are completely separate and independent.
The map that is actually used for the Drop Function is the Tx Active Map; the map that is
actually used for the Insert function is the Rx Active Map. Two additional maps exist: the Tx
Edit Map and the Rx Edit Map. The Edit Maps are the buffer areas that are used when creating
or modifying a map through the modem's LCD; when editing is complete, the appropriate map
should be copied to the Active Map.
Any map may be copied to any other map with the exception of the ROM maps. These maps
may only be the source of the data used to create a User, Edit, or Active Map.
Maps can be created in the map editor and stored as "User Maps". New "Active Maps" can be
downloaded during Modem Operation but this will result in a temporary disruption of service on
the terrestrial line or the Satellite transmission.
MN-OM20– Revision 5
Table E-2. D&I ROM Maps
T1/E1 Time Slot
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Appendix E
E–13
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