Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The user can force the DACS module to use any of the eight maps, or the DACS module may be
configured to automatically change maps based upon the status of the eight ports.
The user is allowed a large amount of flexibility in configuring which map will be used under which
circumstances. Each of maps 1 through 7 has programmable criteria that must be met for that map to
be used. If the criteria is met for more than one map, the map with the highest number is used (the
higher number indicates higher priority). Map 0 is the default map and is used whenever no other map
satisfies the specified criteria.
Each map is configured to protect the network from one or more port failures. The map select criteria
for a port consists of three port failure tests represented by columns A, B, and C in Figure 5-24.
Criteria A is considered met only if all of the ports specified (checked by the user) are faulted. The
same is true for criteria B. Criteria C is considered met whenever any one or more of the specified
ports are faulted.
The combination of these three criteria is chosen to define the faulted conditions that the map is
designed to work around. The criteria is such, that if criteria C is met and either criteria A or B (or
both) is met, the fault requirements for the map are considered met. However, in order to protect from
faulted ports, the map will require other ports to be operational. (For example, if port 4 fails and we
create a map to re-route this data through port 2, this map will only work if port 2 is good.) For this
reason, criteria D is considered met only if none of the selected ports are faulted. Thus, in order for a
map to be used, criteria C and D, and (either A or B) must be met.
If one or more ports is faulted and a map has been switched into to protect the network, a line alert is
declared (there is a problem but the system has worked around it). Also, if a port has a fault but no
map has been created to protect from this fault (for example, if the port is only used for backup
purposes so no corrective action is called for), a line alert is also declared. If however, a fault was
detected and a map was created to accommodate the fault (as defined by criteria A, B, and C), but the
map cannot be used because a required port (as defined by criteria D) is also faulted, a line alarm is
declared.
If no ports are selected for criteria A, B, C, or D, the criteria is ignored in the evaluation. Additionally,
note that it would not make sense to select a port for criteria D if it were selected for any other criteria
for the same map.
After the Map Select Criteria is programmed for Map 1, then select Map Select Criteria for Maps 2
through 7 and program them accordingly. After Map Select Criteria is set for all seven maps click on
the “Exit” button to return to the previous window as shown in Figure 5-24.
The next step is to program DACS module DS0 Maps 0 through 7. To do this click on the “DS0 Map”
button in the Map Window shown in Figure 5-24. This will bring you to the “DACS module DS0 Map
0” window shown in Figure 5-25
In the upper left hand box you will see 1,01 which means Port 1, Timeslot 1.
In the lower left hand box you will see 1,24 which means Port 1, Timeslot 24.
In the upper right hand box you will see 8,01 which means Port 8, Timeslot 1.
In the lower right hand box you will see 8,24 which means Port 8, Timeslot 24.
M-DACS-T1 RFL Electronics Inc.
February 28, 2006 5-38 (973) 334-3100
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