laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-e1-hardware/+/27316 )

Change subject: manual: Document the factory default jumper setting ......................................................................

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 --- M doc/manuals/chapters/hardware.adoc 1 file changed, 7 insertions(+), 2 deletions(-)

Approvals: Jenkins Builder: Verified tnt: Looks good to me, but someone else must approve laforge: Looks good to me, approved

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 [options="header"]