Appendix C: WAN Terms and Acronyms
LCV — Line Coding Violation, a count of both BPVs and EXZs occurring over the accumulation period. An EXZ increments the LCV by one regardless of the length of the zero string.
LEX — LAN Extender, a Cisco Systems protocol used to internetwork a
LMP — Link Management Protocol, used in Frame Relay. Allows the device to gather information about the DLCIs (Data Link Connection Identifiers) See
Local Timing — Timing for digital transmission circuit is internally generated by a source within the equipment. Usually used for short haul private lines. In this case one CSU must be set for Local (internal) timing and the CSU at the other end of the line must be set for Loop (recovered) timing to create a
Loop Timing — Timing for digital transmission circuit is recovered from the received data, not generated internally by a source within the equipment. This is the typical situation when using public lines. Also may be referred to as clock slave timing.
LLB — Line Loop Back, a full T1 loopback on D4 or ESF framed lines.
LOS — Loss of Signal, DS3 signal where a predetermined amount of pulses without polarity are deemed a defect.
M13 — (pronounced
MIM — Media Interface Module, Cabletron Systems products designed to fit in a Multi Media Access Center (MMAC) hub.
MUX — Multiplexer, an electronic device that allows two or more signals to pass over one communications circuit.
NI — Network Interface.
OOF — Out of Frame, a DS3 OOF defect is detected when any three or more errors in sixteen or fewer consecutive
