Connection Sample; Nvr41/41-P/41-8P/41-W/21-S2/21-P-S2/21-8P-S2/41-4Ks2/41-P-4Ks2/41-8P-4Ks2/21-4Ks 2/21-P-4Ks2/21-8P-4Ks2 Series - Dahua NVR41 Series User Manual

Step 9 Secure the HDD bracket and put the top cover back.

3.6 Connection Sample

3.6.1
NVR41/41-P/41-8P/41-W/21-S2/21-P-S2/21-8P-S2/41-4KS2/41-P-4
KS2/41-8P-4KS2/21-4KS2/21-P-4KS2/21-8P-4KS2 Series
See Figure 3-40 for connection sample.
Figure 3-38
Figure 3-39
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User's Manual