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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
GSM Uplink / Downlink
GSM 900
DCS 1800
PCS 1900
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
| 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 |
| 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) |
| 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 |
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