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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
GSM Uplink / Downlink
GSM 900
DCS 1800
PCS 1900
GSM Frequency Bands
| 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
| 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 |
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 |
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