code: def systemInformationType1():
      
      a = L2PseudoLength(l2pLength=0x15)
      b = TpPd(pd=0x6)
      c = MessageType(mesType=0x19)  # 00011001
      d = CellChannelDescription()
      e = RachControlParameters()
      f = Si1RestOctets()
      packet = a / b / c / d / e / f
      return packet
docs: SYSTEM INFORMATION TYPE 1 Section 9.1.31