ons are identified by a 16-bit Connection Identifier (CID). In MS initialization, two pairs of management connections, basic connections (UL and DL) and primary management connections (UL and DL), are established between the MS and the BS, and a third pair of management connections (secondary management, DL and UL) may be optionally established. The three pairs of management connections correspond to three different levels of QoS for management messages between the MS and the serving BS. The basic connection is used by the BS MAC and the MS MAC to exchange short, time-urgent MAC management messages. The primary management connection is used by the BS MAC and the MS MAC to exchange longer, more delay- tolerant MAC management messages. In addition, the secondary management connection may be used by the BS and MS to transfer delay-tolerant, standards-based Dynamic Host Configuration Protocol (DHCP), Trivial File Transfer Protocol (TFTP), and Simple Network Management Protocol (SNMP) messages. The messages carried on the secondary management connection may be packed and/or fragmented. Use of the secondary management connection is required only for a managed MS [1]. The CIDs for these connections are assigned in the RNG-RSP, REG-RSP, or MOB_BSHO-REQ/RSP for pre-allocation in handover (HO) scenarios. When CID pre-allocation is used during HO, a primary management CID may be derived based on basic CID without assignment in the messages. The message exchanges provide three CID values. The same CID value is assigned to both members (UL and DL) of each connection pair. Trivial File Transfer Protocol (TFTP) is a file transfer protocol with a very basic form of the File Transfer Protocol (FTP) functionality that was first defined in 1980. CHAPTER 6 The IEEE 802. 16m MAC CPS (Part I) An IEEE 802.16 MS and its active connections are identified with global and logical addresses during operation in the network. The MS, RS, and BS are identified by the globally unique 48-bit IEEE Extended Unique Identifier (EUI-48TM) based on the