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laforge, 02/19/2016 10:47 PM
PageOutline = 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.
HardwareImage(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
The CTU has a serial console, we describe it in [wiki:Motorola_Horizon_macro/CTU_Console] === 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 |
=== 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.
*http://read.pudn.com/downloads61/ebook/212957/SYS01.pdf
Updated by laforge about 8 years ago · 11 revisions