2. The next available SYNC port of the first HSS unit should be connected to SYNC 10
of the second HSS unit as shown in Figure 7-7. In the illustration, the next
available port on the first HSS unit is SYNC 6.
3. The second HSS unit may be filled out with up to nine more ODUs in reverse
order. That is, connect SYNC 9, SYNC 8, SYNC 7... as shown in Figure 7-7.
Figure 7-7: Cascading two HSS units
4. To add a a further HSS unit: Connect the next available SYNC port from the
second HSS unit in descending order (SYNC 5 in Figure 7-7) to SYNC 1 of the
third HSS unit.
5. ODUs are connected to the third HSS unit from SYNC 2 as shown in Figure 7-8,
in ascending order:
Figure 7-8: Cascading three HSS units
6. If further ODUs are required, observe the convention that additional even
numbered units are populated in descending order from SYNC 9 and odd
numbered HSS units are populated in ascending order from SYNC 2.
Note
If an ODU is disconnected from an HSS unit, then all remaining ODUs must
be moved up or down to maintain the connectivity.
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