The recommended length values shown are based on typical attenuation values for the cables listed and the following criteria: Maximum length = 30 dB loss at 1/2 the clock frequency: SMPTE ST 259. This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmission and Multiplexing (TM), and is now submitted for the Voting phase of the ETSI standards Two-step Approval Procedure. The present document specifies the technical requirements and test. Pigtails are used for non-permanent connections in patch panels, transmission equipment etc. NEXCONEC® pigtails are suitable for telecommunication networks, data processing networks, FTTx, FTTH and some critical applications. The STM-1 frame consists of overhead plus a virtual container capacity (see Figure 1). Assemblies are available in standard lengths of 1, 2, 3, and 5 metres, (custom lengths are also available).