Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

GSM Timeslot & Frequency Specifications

These diagrams show how timeslots and corresponding frequencies are allocated in the GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), DCS (Digital Communications System), and PCS (Personal Communications Service) bands. A GSM Multiframe is the basic unit, and is 120 ms long. There are 26 Frames in each Multiframe, with each Frame being 4.61538 ms long (120 ms/26). Within each Frame are 8 Timeslots at 576.92 μs per Timeslot (577 μs in round numbers). Finally, there are 156.25 Bits per Timeslot, each Bit being 3.69231 μs long.

Tables of all GSM Frequency Bands, GSM Frequency Calculations, and GSM Timing are provided at the bottom of the page.



Data derived from ETSI EN 300 910 .


GSM Time Slot, Frame, & Multiframe
RF Cafe - GSM timeslot chart drawing frames timing




GSM Uplink / Downlink
RF Cafe - GSM timeslot chart drawing frames timing uplink downlink




GSM 900
RF Cafe - GSM timeslot chart drawing frames timing frequency




DCS 1800
RF Cafe - GSM timeslot chart drawing frames timing DCS




PCS 1900
RF Cafe - GSM timeslot chart drawing frames timing PCS




GSM Frequency Bands

System Band Uplink (MHz) Downlink (MHz) Channel Number
T-GSM 380 380 380.2 - 389.8 390.2 - 399.8 Dynamic
T-GSM 410 410 410.2 - 419.8 420.2 - 429.8 Dynamic
GSM 450 450 450.4 - 457.6 460.4 - 467.6 259 - 293
GSM 480 480 478.8 - 486.0 488.8 - 496.0 306 - 340
GSM 710 710 698.0 - 716.0 728.0 - 746.0 Dynamic
GSM 750 750 747.0 - 762.0 777.0 - 792.0 438 - 511
T-GSM 810 810 806.0 - 821.0 851.0 - 866.0 Dynamic
GSM 850 850 824.0 - 849.0 869.0 - 894.0 128 - 251
P-GSM 900 900 890.0 - 915.0 935.0 - 960.0 1 - 124
E-GSM 900 900 880.0 - 915.0 925.0 - 960.0 975 - 1023, 0-124
R-GSM 900 900 876.0 - 915.0 921.0 - 960.0 955 - 1023, 0-124
T-GSM 900 900 870.4 - 876.0 915.4 - 921.0 Dynamic
DCS 1800 1800 1710.0 - 1785.0 1805.0 - 1880.0 512 - 885
PCS 1900 1900 1850.0 - 1910.0 1930.0 - 1990.0 512 - 810
 

GSM Frequency Calculations

Frequency Band ARFCN Range Uplink Frequency
(MHz)
Downlink Frequency
(MHz)
P-GSM 900 1..124 890+0.2*ARFCN 935+0.2*ARFCN
E-GSM 900 0..124
975..1023
890+0.2*ARFCN
890+0.2*(ARFCN-1024)
935+0.2*ARFCN
935+0.2*(ARFCN-1024)
DCS 1800 512..885 1710.2+0.2*(ARFCN-512) 1805.2+0.2*(ARFCN-512)
PCS 1900 512..810 1850.2+0.2*(ARFCN-512) 1930.2+0.2*(ARFCN-512)
R-GSM 900 0..124
955..1023
890+0.2*ARFCN
890+0.2*(ARFCN-1024)
935+0.2*ARFCN
935+0.2*(ARFCN-1024)
GSM 450 259..293 450.6+0.2*(ARFCN-259) 460.6+0.2*(ARFCN-259)
GSM 480 306..340 479+0.2*(ARFCN-306) 489+0.2*(ARFCN-306)
GSM 850 128..251 824.2+0.2*(ARFCN-128) 869.2+0.2*(ARFCN-128)
GSM 750 438..511 747.2+0.2*(ARFCN-438) 777.2+0.2*(ARFCN-438)


GSM Timing
  Symbol Bursts Frames Time Rate
Symbol 1 1/8 1/1250 48/13 μs (3.692 μs) 270833/s
Burst 156.25 1 1/8 15/26 ms (576.9 μs) 1733/s
Frame 1250 8 1 60/13 ms (4.615 ms) 216.6/s
26 Multiframe 32500 208 26 120 ms 8.333/s
51 Multiframe 63750 408 51 235.4 ms 4.248/s
52 Multiframe 65000 416 52 240 ms 4.167/s
Superframe 2071875000 84864 1326 6120 ms 9.803/min
Hyperframe 4.2432E+12 173801472 2715648 3h:28m:53.760s 6.893/day
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel