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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
This commit is contained in:
Harald Welte 2022-02-23 22:00:09 +01:00
parent ce1262fc51
commit 4d8e12413f
1 changed files with 7 additions and 2 deletions
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doc/manuals/chapters/hardware.adoc
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@ -44,8 +44,13 @@ up:
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
[options="header"]