kilobits mỗi lớp thứ hai km 2 Tunneling Protocol Địa Phương Khu vực Liên kết Mạng truy cập liên kết Nghị định thư-cân bằng giao thức kênh D-Link Thủ tục truy-Frame chế độ hợp lý kênh số thấp trễ-Mã kích thích tuyến tính dự báo Label Distribution Nghị định thư địa phương trao đổi công ty logic điều khiển liên kết | Acronyms and Abbreviations 201 kbit s kilobits per second km kilometer L2TP Layer 2 Tunneling Protocol LAN Local Area Network LAP-B Link Access Protocol-Balanced LAP-D Link Access Protocol-Channel D LAP-F Link Access Procedure-Frame Mode LCN logical channel number LD-CELP Low-Delay-Code-Excited-Linear Prediction LDP Label Distribution Protocol LEC local exchange company LLC logical link control sublayer LIB label information base LSA link state advertisement LSB least significant bit LSP label switched path MAC medium access control MAE metropolitan area exchange MAU multistation access unit Mbps MBS megabits per second maximum burst size MCR minimum cell rate MDF main distributing frame MG media gateway MGCP Media Gateway Control Protocol MLT-3 multilevel threshold-3 signal format MN matched node MOS mean opinion score MPEG Motion Picture Engineering Group MPLS multiprotocol label switching MRU maximum receive unit MSB most significant bit MSS maximum segment size MTU maximum transmission unit NAP network access point NAK negative Acknowledgment 202 List of Acronyms and Abbreviations NAV network availability vector NBMA NCP NEXT nonbroadcast multiple access network control point near-end crosstalk nm nanometer NNI NRZ NRZI OC-1 OC-N OFDM OOF ONU OPTIS OSI OSPF node-network interface nonreturn to zero nonreturn to zero invert on ones optical carrier level 1 optical carrier level N orthogonal frequency division multiplexing out of frame event optical network unit overlapped pulse amplitude modulation with interlocked space open systems interconnection open shortest path first PAM PCF PCM PCR pulse amplitude modulation point coordination function pulse code modulation peak cell rate PDU P F bit PI PIC PIFS PLCP protocol data unit poll final bit protocol interpreter polyolefin-insulated cable point coordination function interframe space physical layer convergence procedure PLP Packet Layer Protocol POTS plain old telephone service PPP PPTP Point-to-Point Protocol .