manual: Document the factory default jumper setting
Also re-word/expand a bit on the situations in which NT mode
or cross-over is needed.
Change-Id: Ie726d4ca2e8605015a2f0384d2b435e1b40c1cad
diff --git a/doc/manuals/chapters/hardware.adoc b/doc/manuals/chapters/hardware.adoc
index 0e129c2..4a1de14 100644
--- a/doc/manuals/chapters/hardware.adoc
+++ b/doc/manuals/chapters/hardware.adoc
@@ -44,8 +44,13 @@
The pin-out of the connectors can be swapped between TE and NT mode using
the J4 and J5 jumper blocks on the circuit board.
-A GSM BTS typically implements TE pin-out, while the icE1usb should then
-use NT mode pin-out if no cross-over cable is used.
+The factory default setting of the jumpers is TE-mode.
+
+In case you're using the icE1usb with user-side equipment such as a GSM BTS,
+a PBX, a Router or the like which traditionally was attached to the public
+network, those devices all implement TE mode. In such situations you need
+to either switch the icE1usb to NT mode (and use straight wiring), or use
+an E1 cross-over cable.
.Pin-out of RJ45 E1 connectors
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