Motorola Horizon macro » History » Revision 9
Revision 8 (laforge, 02/19/2016 10:47 PM) → Revision 9/16 (laforge, 02/19/2016 10:47 PM)
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= Motorola Horizon macro BTS =
The Motorola Horizon macro BTS is a BTS model manufactured by Motorola in the late 1990ies.
It can support up to 6 TRX, typically in a configuration of 3 sectors.
There is currently no support for it in OpenBSC, but we are working on it.
== Hardware ==
[[Image(horizonmacro_cabinet_door_open.jpg, 50%)]]
[[Image(horizonmacro_cabinet_top.jpg, 33%)]]
=== CTU ===
The up to 6 CTU modules are the individual transceivers. They plug into the SURF RF backplane and have a front-accessible
DB9 serial port, as well as a SMA connector for the TX PA output.
This TX PA output is normally wired using a ~10cm semi-rigid SMA cable to the TX input port of a combiner.
The CTU is of course fully shielded. But if you remove the shielding cover, it looks like this:
[[Image(horizonmacro_ctu_pcb.jpg, 50%)]]
You can see
* two diversity receivers in the top left part
* digital section in the top right part
* transmit section (exciter) in the center
* RF power amplifier in the bottom right part
=== Combiner ===
The combiner / duplexer combines the TX signal of two CTU and duplexes it with the Rx path in order to be able to have two TRX attached to one antenna
=== MCUF ===
The MCUF is a full-size digital board and contains the BTS controller
[[Image(horizonmacro_mcuf_pcb_top.jpg, 33%)]]
[[Image(horizonmacro_mcuf_front.jpg, 33%)]]
=== NIU ===
The NIU is a E1 interface card for up to two E1 lines. Multiple NIU boards can be plugged into the rack
[[Image(horizonmacro_niu_pcb.jpg, 50%)]]
=== BPSM ===
The BPSM is a small power supply for the NIU, MCUF and other digital boards
[[Image(horizonmacro_bpsm_pcb.jpg, 50%)]]
=== ALARMS ===
The ALARMS board is monitoring FAN and other alarms in the cabinet.
[[Image(horizonmacro_alarms_pcb.jpg, 50%)]]
=== A-bis interface ===
The A-bis interface is via classic E1 lines. The Horizon indoor cabinet supports up to 6 E1 ports.
Each NIU module serves 1 or 2 E1 ports.
The E1 ports are physically routed to the BIB (Balanced Interface Board) module on top of the cabinet.
The pinout of the 37pin D-Sub connector on top of the BIB board has been reversed as:
||Pin ||Transformer||Usage||
||1 ||T1.1 ||NIUA0 Port 0 (Tx)||
||2 ||T2.1 ||NIUA0 Port 0 (Rx)||
||3 ||GND ||
||4 ||T4.1 ||
||5 ||T5.1 ||
||6 ||GND ||
||7 ||T7.1 ||
||8 ||T8.1 ||
||9 ||GND ||
||10 ||T10.1 ||
||11 ||T11.1 ||
||12 ||GND ||
||13 ||T13.1 ||
||14 ||T14.1 ||
||15 ||GND ||
||16 ||T16.1 ||
||17 ||T17.1 ||
||18 ||GND ||
||19 ||GND ||
||20 ||T1.8 ||NIUA0 Port 0 (Tx)||
||21 ||T2.8 ||NIUA0 Port 0 (Rx)||
||22 || ||
||23 ||T4.8 ||
||24 ||T5.8 ||
||25 || ||
||27 ||T7.8 ||
||28 ||T8.8 ||
||29 ||T10.8 ||
||30 ||T11.8 ||
||31 || ||
||32 ||T13.8 ||
||33 ||T14.8 ||
||34 || ||
||35 ||T16.8 ||
||36 ||T17.8 ||
== Software ==
=== MCUF ===
There is a 20MByte Intel Series2 Flash PCMCIA card inside the MCUF. It contains software + configuration for the BTS.
[[Image(horizonmacro_pcmcia_iflash2.jpg, 33%)]]
There once has been a mtd_iflash2.c driver for Linux 2.4.x, but apparently it has never been merged mainline before the
big CardServices API redesign happened in 2.6.x. So unfortunately it's not straight-forward to read them out :(
The MCUF is able to run without the PCMCIA card. In this case, it will download all software + config via E1 from the BSC.
The MCUF has a very extensive command line interface (MMI), for more information check [wiki:Motorola_Horizon_macro/MCUF_Console]
=== CTU ===
It is assumed that the CTU only contains a boot loader to download the real software from the MCUF.
