AS NZS 14763.3:2017 pdf download.Information technology—Implementation and operation of customer premises cabling Part 3: Testing of optical fibre cabling (ISO/IEC 14763-3:2014, MOD).
6.3.3.4 LSPM combination launch test cord/tail test cord A duplex launch test cord/tail test cord shall be
a) terminated at one end with one duplex or 2 simplex (duplexible) connectors suitable for attachment to the LSPM equipment,
b) terminated at the other end with one duplex or 2 simp!ex (duplexible) reference connectors compatible with the interface to the installed cabling.
6.3.3.5 LSPM substitution test cord
The substitution test cord shall be terminated at both ends with reference connectors
compatible with the interfaces to the installed cabling.
6.3.3.6 OTDR launch test cord
The OTDR should provide the specified launch modal distribution (see 6.4). For the multimode QTDR launch test cord, if the OTDR is not known to provide the specified launched modal distribution, then the launch test cord shall contain a suitable mode-controlling device to ensure that the specified launched modal distribution is maintained.
The launch test cord should be
a) longer than the attenuation dead zone of the OTDR (see Annex C for further details),
b) long enough for a reliable straight-line fit to be made to the backscatter trace following the dead zone (CI to C2 in Figure II) so that reliable attenuation measurements may be carried out. For example, in multimode fibre installations the length of the launch test cord should be at least 75 m. For single-mode fibre installations the length of the launch test cord should be at least 150 m,
c) terminated at one end with one or more connectors suitable for attachment to the QTDR,
d) terminated at the other end with one or more reference connectors compatible with the interface to the installed cabling.
The length of optical fibres used to create OTDR launch test cords often requires that they be protected within a closure (see Figure 5).AS NZS 14763.3 pdf download.