TOH (Transport OverHead)

In a SONET or SDH frame, the overhead dedicated to control of data

transport between network elements (NEs).TOH comprises Section Overhead (SOH) and Line Overhead (LOH). SOH of nine octets is dedicated to the transport of status, messages, and alarm indications for the maintenance of links between add/drop multiplexers (ADMs). LOH of 18 octets controls the reliable transport of payload data in the Synchronous Payload Envelope (SPE) between any two NEs. See also ADM, frame, link, NE, octet, overhead, payload, SDH, and SONET.

• Low-Power Radio Service (LPRS)
• Low-Power Radio Service (LPRS)
• low-tier
• low-tier
• low voltage (LV)
• low-water-peak fiber (LWPF)
• LPC (Linear Predictive Coding)
• lpi (lines per inch)
• LPRS (Low-Power Radio Service)
• LRC (Longitudinal Redundancy Check)
• LRN (Location Routing Number)
• LSB (Least Significant Bit)
• LSP (Label Switched Path)
• LSR (Label Switching Router)
• Luddite
• LU (Logical Unit)
• luminance
• luminance
• luminance
• luminiferous ether
• luminous flux
• lumped amplification
• LUNI (LANE User-to-Network Interface)
• LV (Low Voltage)
• LW (Long Wavelength)