ETSI EG 201 900-1
ETSI EG 201 900-1
Services and Protocols for Advanced Networks (SPAN); Narrowband Services over ATM; Loop Emulation Service (LES) using AAL2; Part 1: LES interface specification [ATM Forum Specification AF-VMOA-0145.000 (2000), modified]
standard published 04/01/2001 by European Telecommunications Standards Institute