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GUIDE TO INSTALLATION AND OPERATION
12
| HDA-1911/1931
HDA-19NN-DRP
Double rear for 1x9 operating mode.
HDA-19NN-DRP-R
Double rear for 1x9 operating mode with bypass protection relay.
HDA-19NN-DRP-F
Double rear for 1x8 operating mode with fiber option support.
HDA-193N-DRP
Double rear for dual 1x4 operating mode (HDA-1931 only).