DOC: update L2 nFAPI simulator

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

doc/L2NFAPI.md

@@ -14,19 +14,24 @@
 
 This simulator allows to test L2 and above Layers using the nFAPI interface.
 
-**This simulator is available starting the `v1.0.0` release on the `master` branch.**
-
-Currently the only validated deployment by CI and developers is *with S1 interface and eNB / UEs are on the same machine*.
-
-Others deployments will be supported later after bug fixes and validation in the CI process.
-
-1. [With S1 -- eNB and UE on same machine](L2NFAPI_S1.md)
+The UE executable is able to "simulate" multiple UEs in order to stimulate the scheduler in the eNB.
 
+**This simulator is available starting the `v1.0.0` release on the `master` branch.**
 
+Currently the Continuous Integration process is validating this simulator the following way:
 
+*  the LTE modem executable is run on one host (in our CI deployment it is a **Xenial Virtual Machine**)
+*  the UE(s) modem executable is run on another host (in our CI deployment it is also a **Xenial Virtual Machine**)
+*  We are testing:
+   *   in S1 mode (ie we are connected to a 3rd-party EPC)
+   *   in noS1 mode (no need for an EPC)
 
+Normally it should be fine to run both executables on the same host using the `loopback` interface to communicate. **But we are not guaranting it**
 
+1. [With S1 -- eNB and UE on 2 hosts](L2NFAPI_S1.md)
+2. [No S1 -- eNB and UE on 2 hosts](L2NFAPI_NOS1.md)
 
+----
 
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