Adtec digital DTA-3050 (version 6.02.14) Manual - Manual (Page 62)

N + 1 Encoder Redundancy and N + 2 Encoder Redundancy
N+1 and N+2 encoder redundancy allow one encoder to act as a redundant encoder for a group of encoders. Though 1:1
provides one backup for each primary encoder, this level of redundancy is seldom required, since the Edje-2x00 encoders are
highly reliable and seldom fail. Therefore, N+1 and N+2 encoder redundancy provide a more economical solution.
To support N+1 or N+2 redundancy requires an external router/switcher be connected before the encoders. The Pesa LNS8
has been integrated into the DTA-3050 design.
N +1 Encoder Redundancy- Illustration
4 + 1 Redundancy Example
User Interface 54