The WISI Inca Networks GT 21 W module is part of the Tangram product portfolio. The GT 21 W module allows you to add up to 6 services in PAL /SECAM or NTSC format per module to your network. Tangram is a very high density and highly flexible solution for all kinds of networks. The WISI Tangram chassis uses a fully redundant concept (n+1, 1+1).
Tangram GT 21 W Module
![](https://www.goamt.com/wp-content/uploads/2017/03/wisi-gn-21-w-e1489597262202.png)