diff --git a/GSM/GSMCommon.cpp b/GSM/GSMCommon.cpp
index 8aba3be..711ca70 100644
--- a/GSM/GSMCommon.cpp
+++ b/GSM/GSMCommon.cpp
@@ -54,7 +54,10 @@
 
 const BitVector GSM::gDummyBurst("0001111101101110110000010100100111000001001000100000001111100011100010111000101110001010111010010100011001100111001111010011111000100101111101010000");
 
-const BitVector GSM::gRACHSynchSequence("01001011011111111001100110101010001111000");
+/* 3GPP TS 05.02, section 5.2.7 "Access burst (AB)", synch. sequence bits */
+const BitVector GSM::gRACHSynchSequenceTS0("01001011011111111001100110101010001111000");  /* GSM, GMSK (default) */
+const BitVector GSM::gRACHSynchSequenceTS1("01010100111110001000011000101111001001101");  /* EGPRS, 8-PSK */
+const BitVector GSM::gRACHSynchSequenceTS2("11101111001001110101011000001101101110111");  /* EGPRS, GMSK */
 
 //                               |-head-||---------midamble----------------------||--------------data----------------||t|
 const BitVector GSM::gRACHBurst("0011101001001011011111111001100110101010001111000110111101111110000111001001010110011000");