Overview

Clasic E1/T1 based BTS

Supported Vendors/Dialects

Siemens (only BS-11 tested)
Ericsson RBS2xxx (RBS2307, 2308, 2111 tested)
Nokia InSite, MetroSite

Pro	Con
available inexpensively from decomissioned sites	appears a bit antiquated
up to 12 TRX	not many people familiar with E1/T1 anymore
high RF output power	no convenient testing/debugging of E1/T1 issues
rugged mechanical build, high MTTF	high power consumption
	older models no EGPRS, no AMR

Classic E1/T1 based BTS

images/har2009-bs11_at_tree.jpg

Clasic E1/T1 based BTS

images/har2009-bs11_antennas2.small.jpg

This is how it all started
E1 based BTS (Siemens BS-11)
HAR 2009 - Dutch Hacker Camp
Antennas mounted with duct tape to tree
E1 back-haul over CAT5 to OpenBSC running in tent

Ericsson RBS 2308

images/rbs2308.jpg

Many RBS2000 models
All very similar on protocol
Not all models tested
Good results with RBS2308 + RBS2111

ip.access nanoBTS

images/nanoBTS_small.png

PoE-enabled single-TRX 200mW indoor BTS
GPRS/GSM only models and EGPRS-enabled models
available in band-specific versions for all four bands
proprietary BTS and PCU inside
- lots of PCU crashes reported by users :(
- no way for us to fix it
No fully dynamic channels (TCH/F + TCH/H + PDCH)

sysmoBTS

images/symoBTS_v2D_front_1024.jpg

sysmocom builds family of GSM BTS based on OsmoBTS + OsmoPCU
revenue from this sales used to cross-subsidize OsmoBTS development
osmo-bts-sysmo uses shared-memory /dev to talk to PHY
osmo-pcu uses shared-memory /dev to talk to PHY

Model	RF Pwr	TRX	Outdoor	PoE	Quad-Band
sysmoBTS 1002	0.2 W	1	No	No	Yes
sysmoBTS 1002 OD	0.2 W	1	Yes	Yes	Yes
sysmoBTS 1020	2.0 W	1	Yes	Yes	No
sysmoBTS 1100	10.0 W	1	Yes	No	No
sysmoBTS 2050	2x 5 W	2	Yes	No	No
sysmoBTS 2100	2x10 W	2	Yes	No	No

Nuran LiteCell 1.5

images/litecell15.jpg

10W 2-TRX Outdoor BTS
osmo-bts-litecell15 uses shared-memory /dev to talk to PHY
osmo-pcu uses shared-memory /dev to talk to PHY

Octasic OCTBTS with OCTPHY-2G

images/octbts_3600_photo__large.png

not a ready-to-deploy BTS product, more a BTS development board
- no enclosure, no PA, no filters
proprietary PHY runs in Octasic DSP
- raw Ethernet frames towards osmo-bts-octphy
- unix domain pcu-socket to osmo-pcu
series of different board models (3000, 3500, 3600) with different number of DSPs, radio interfaces, ARM/x86 processor core
two TRX per DSP possible
not all voice codecs supported
EGRPS integration with OsmoPCU not working yet

EOF

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