BS11Getting Started » History » Revision 9

« Previous | Revision 9/24 (diff) | Next »
laforge, 02/19/2016 10:47 PM
PLL mode

If you have just purchased a new BS-11, this guide will give you some basic instructions on how to proceed.

Check Package contents

Please check the [wiki:BS11_Package_List Packing List] and see if you can find all the items in your two boxes.
If there is any doubt, please contact the openbsc mailing list and ask for help.

Unpacking the BS-11

You can now unpack the BS-11 (the heavier box). Make sure you do this with two people handling the unit, 36-48kg of weight
are not meant to be lifted by a single person.

We recommend you mount the wall-mount (from the lighter of the two boxes, packaged in a small brown parcel) to the back of the BS-11,
since this gives it a flat surface. without the wall mount you have a single metal ridge poking out at the back, scratching your floor/table
or other surface.

'''NOTE: If you want to operate the BS-11 for more than just a bit of testing, especially with an enabled 2nd TRX, you definitely should mount
it vertically to a pole or wall, since this enables airflow through through the cooling fins'''

Build a power cable

Please follow the instructions at [wiki:BS11_Configuration] to manufacture the power cable

Build E1 cable

Please follow the instructions at [wiki:BS11_Configuration] to manufacture the E1 cable
from RJ45 to the strange RADIALL twinax connectors

Configure the BS-11 Jumpers

If you remove the connector cover (loosen three Philips screws), you will uncover the four E1 connectors,
as well as the RS232 ports. There are also four green jumpers at the side of the connector panel. The
factory default of those connectors is 75Ohms. You need to remove all of the four jumpers to switch to
120Ohms termination.

Mount and connect the BS-11 Antenna

The Antenna needs to be attached to the BS11 main unit by the means of four screws. Screws are included in
a small plastic bag.

Connect the four RF antenna cables to the connectors of the BS-11. Their order is 1:1, i.e. leftmost plug into leftmost socket, etc.

Be aware of the fact that the panel antenna adds some gain to the transmission path. So even if you configure the BTS to transmit with the lowest power possible, the effective radiated power (ERP) may exceed permitted limits.

Test the BS-11 status and configuration * connect the power plug to the BS-11 * connect the RS232 cable to J2 of the BS-11 (see photograph) * connect the RS232 cable to your PC * switch on the power switch of the BS-11 (the LED should light up green in 2-3 seconds) * start the ''bs11_config'' program to observe the boot process (see [wiki:bs11_config] for details) * you should observe the boot process like it is indicated at the [wiki:bs11_config] page * at the end of the process (10 minutes or so), you should have ''Phase 3 Normal'' and ''MBCCU0 Load'' and ''Abis-Link Restoring'' * MBCCU1 might be ''Load'' or ''No Load'', depending on whether TRX1 is activated or not {{{
PHASE: 3 Normal MBCCU0: Load MBCCU1: No Load Abis-link: Restoring
}}} * Once you are in "Phase 3 Normal", use ''bs11_config query'' to query the configuration * OML TEI must be 25 * OML E1 Timeslot must be 1 and the full 64kbps timeslot (Full Slot) {{{
E1 Channel: Port=0 Timeslot=1 (Full Slot)
TEI: 25
}}} * It is normal if you see a GET ATTRIBUTE NACK at the end of the output, as the ''query'' mode tries to
query the PA RF Power setting of TRX1 (which by default is not enabled at all).

=== TEI / E1 timeslot ===

If your TEI or E1 Timeslot is configured to a wrong value, you can use the following sequence of commands to fix it: {{{
$ ./bs11_config disconnect # you should now be in ''State 2 Maintenance''
$ ./bs11_config oml-tei # you will see a SET ATTRIBUTE ACK and can then terminate the program
$ ./bs11_config reconnect # brings you back to ''State 3 Normal''.
$ ./bs11_config query # to verify that the setting of E1 Timeslot and TEI is now correct

If you see any other difference (i.e. not reaching ''Phase 3 Normal'' or no ''MBCCU0 Load'') please
contact the mailinglist with the full details.

If everything is correct, you can proceed as follows:

=== PLL Mode ===

The PLL of the BS-11 can be set to two different modes: # Locked to the E1 clock that is received from the HFC-E1 card # A built-in standalone oscillator

Unless you have some accurate E1 clock source (like a physical ISDN line to a telephone network), we recommend you
configure the PLL Mode to ''Standalone''

==== Standalone ==== {{{
$ ./bs11_config disconnect
bs11_config (C) 2009 by Harald Welte and Dieter Spaar


PHASE: 3 Normal MBCCU0: Load MBCCU1: Load Abis-link: Restoring
PHASE: 2 Maintenance MBCCU0: Load MBCCU1: Load Abis-link: Down
}}} {{{
$ ./bs11_config pll-standalone
bs11_config (C) 2009 by Harald Welte and Dieter Spaar


PHASE: 2 Maintenance MBCCU0: Load MBCCU1: Load Abis-link: Down
SET ATTRIBUTE ObjClass=0xa5 ObjInst=(7,0,0) ACK

==== E1 Locked ====

Like above, but using {{{
$ ./bs11_config pll-e1-locked

Preparing the E1 card

=== HFC-E1 Evaluation Board ===

  • make sure you configure the jumpers for NT Mode and Termination to 120 Ohms, reference [wiki:HFC-E1]
Preparing your PC * Install a current (>= 2.6.27) Linux kernel source * Apply the patch from svn trunk/linux-kernel to your kernel * Configure the kernel as usual, make sure you enable the mISDN core and driver for HFC-E1 (hfcmulti) * Install and boot the kernel, load hfcmulti '''with dslot=1 module load parameter''' * Check out the latest SVN version of OpenBSC * Compile it * You need the following build dependencies: autoconf, automake, gcc, libc6-dev, libdbi-dev, libdbd-sqlite3 {{{
svn checkout
cd openbsc
automake --add-missing
}}} * You may experience compilation problems when you use the latest and greatest trunk version. This is a normal behavior, since OpenBSC is under heavy development. Please contact the mailing list and ask for help in that case. Testing the E1 Link * connect the RJ45 plug of the E1 cable with your E1 card in the PC * connect the two twinax connectors of your E1 cable (correctly!) to the BS-11 connector board, use the two leftmost connectors * keep the LMT / RS232 cable connected * power-on the BS-11 if it is not already powered-up * Start bs11_config and wait until you enter ''Phase 3 Normal, Abis-Link: Restoring'' * run the "bsc_hack" program, pass it the '-f ' paramenter for the [ ARFCN] you want to use. '''Make sure you use a frequency that you have permission to use''', and/or limit your output power to a level that you are allowed to transmit. The default ARFCN is 123. * Verify that bs11_config now prints ''Phase 3 Normal, Abis-Link: Up'' * bsc_hack should print you a lot of yellow lines about setting channel attributes and event state changes * at some point you should see 'Bootstrapping RSL' * congratulations, your BS-11 should be running and you should see the BCCH (network ID 01-001) from a GSM phone.
Files (4)
TX1.PNG View TX1.PNG 8.34 KB TX1 Antenna Standing Wave Ratio , 04/27/2009 07:56 PM
TX2.PNG View TX2.PNG 8.15 KB , 04/27/2009 07:57 PM
jughanns_E1_openBSC_settings.jpg View jughanns_E1_openBSC_settings.jpg 320 KB dexter, 10/09/2009 01:56 PM
bs-11_panel.jpg View bs-11_panel.jpg 290 KB dexter, 10/09/2009 02:03 PM

Updated by laforge over 8 years ago · 9 revisions

Add picture from clipboard (Maximum size: 48.8 MB)