Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
2.2.6 CROSS-CONNECT MODE OF OPERATION
The DACS module has eight bi-directional DS1 ports. The DACS module allows any received DS0
from any port to be transmitted as any DS0 on any port. The DS0 grooming takes place by time slot
interchanging. Each incoming DS1 is disassembled into DS0s. Then each DS0 is temporarily held in
memory, until it is needed to be combined into the outgoing DS1 stream. The DACS module follows
the instructions in a time slot interchange map which determines which incoming DS0s will be aligned
with which outgoing DS0s. Each DACS module contains 8 time slot interchange maps (0 through 7),
one default (normal map) and seven alternate (backup maps). The DACS module maps are normally
programmed at the factory to customer specifications but can be re-programmed by the user. This can
be done via the RS-232 Remote Port on the MA-235 via the Network Management Software as
described in Section 5. A detailed discussion of DACS module mapping can be found in paragraph
2.2.9. A sample mapping of the DACS module can be seen in Figure 2-5 showing time slot
interchanging, pass-thru, and hair pinning modes.
The DACS module contains one normal time slot interchange map (map 0), and seven back-up time-
slot interchange maps (maps 1-7). During normal operation, the DACS module monitors the status of
all enabled port receivers. If a problem is detected by a port receiver, the DACS module will switch (if
switching is enabled) into a backup (or alternate) map. The exact conditions which cause the map
switch, as well as the criteria used to select which map to use, are programmable by the user. Refer to
paragraph 2.2.9 for more detail on DACS module mapping.
M-DACS-T1 RFL Electronics Inc.
October 16, 2012 2-5 (973) 334-3100
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