Radyne OM20 Installation And Operation Manual page 196

OM20 Universal Outdoor Modem
The following paragraphs give examples of typical configurations that could use the ROM Maps
as templates. The ROM Map used would have to be first copied to the appropriate Active
Transmit (Drop) and/or Active Receive (Insert) Map(s) before it could be used. To use a
modification of a ROM Map, the ROM Map must first be copied to the appropriate Edit Map,
then modified, and then copied to the appropriate Active Map.
The mapping of channels to time slots is arbitrary; it is not necessary to
map CH1 to TS1, CH2 to TS2, etc. The channel to the time slot mapping
may be in any order within the constraints of the number of available
channels.
For example, ROM Map 1 could be used as the template for as Active Transmit (Drop) Map for a
modulator configured for 64 Kbps operation. Only the first time slot of the T1 or E1 frame
would be dropped into the modulator transmit path. The Drop Multiplexer would know to look
only at the first entry in the Active Transmit table and would ignore the other 29 entries. If the
map contained an "8" in its first entry, the eighth channel of the T1/E1 frame would be sent to
the modulator.
ROM Map 2 could be used as the template for an Active Receive (Insert) Map for a demodulator
configured for 128 Kbps operation. The demodulated data in the receive path would be inserted
into the first two time slots of the T1 or E1 frame. The Insert Multiplexer would know to look
only at the first two entries in the Active Receive table and would ignore the other 28 entries. If
the first two entries were modified to contain a 27 and 28, the data would be inserted into the 27
th
and 28 time slots of the E1 frame.
ROM Map 3 could be used as the template for an Active Transmit (Drop) Map with a modulator
and/or demodulator configured for 256 Kbps operation. The T1 or E1 Data in the transmit path
or the demodulated data in the receive path would be dropped from and/or inserted into the first
four time slots of the T1 or E1 frame. The Multiplexer would know to look only at the first four
entries in the Active map(s) and would ignore the other 26 entries.
ROM Map 4 could be used as the template for an Active Transmit (Drop) or Active Receive
(Insert) Map with a modulator and/or demodulator configured for 384 Kbps operation. The T1
or E1 Data in the transmit path or the demodulated data in the receive path would be dropped
from and/or inserted into the first six time slots of the T1 or E1 frame. The Insert Multiplexer
would know to look only at the first six entries in the Active map(s) and would ignore the other
24 entries. To Drop the last six channels of a T1 frame into a modulator transmit path, the first
six entries of the Active Transmit map should contain 19, 20, 21, 22, 23, and 24.
ROM Map 5 could be used as the template for an Active Transmit (Drop) and/or Active Receive
(Insert) Map with a modulator and/or demodulator configured for 512 Kbps operation. The T1
or E1 Data in the transmit path or the demodulated data in the receive path would be dropped
MN-OM20– Revision 5
Appendix E
th
E–14