Recommendation G.957 (06/99)
2
–
ITU-T Recommendation I.432.2 (1999), B-ISDN user-network interface – Physical layer
specification: 155 520 kbit/s and 622 080 kbit/s operation.
–
IEC 60825-1 (1998), Safety of laser products – Part 1: Equipment classification,
requirements and user's guide.
–
IEC 60825-2 (1993), Safety of laser products – Part 2: Safety of optical fibre communication
systems; and Amendment 1 (1997).
3
Terms and definitions
3.1 Definitions
This Recommendation defines the following terms:
3.1.1 transverse
compatibility: The capability to mix various manufacturers’ equipments within a
single optical section.
3.1.2 joint
engineering: The process by which Administrations/operators agree on a set of
interface characteristics of an optical link that meet agreed performance characteristics of the link
when the available interface specifications in ITU-T Recommendations are insufficient to ensure the
performance level.
3.2
Terms defined in other Recommendations
This Recommendation uses the following terms defined in other ITU-T Recommendations indicated:
–
S/R reference points: see Recommendation G.955.
–
Synchronous Digital Hierarchy (SDH): see Recommendation G.707.
–
Synchronous Transport Module (STM): see Recommendation G.707.
–
Longitudinal compatibility: see Recommendation G.955.
4 Abbreviations
This Recommendation uses the following abbreviations:
BER
Bit Error Ratio
EX Extinction
ratio
LED Light-Emitting
Diode
MLM Multi-Longitudinal
Mode
NA Not
Applicable
NRZ
Non-Return to Zero
ORL
Optical Return Loss
RMS Root-Mean-Square
SDH
Synchronous Digital Hierarchy
SLM Single-Longitudinal
Mode
STM
Synchronous Transport Module
UI
Unit
Interval
WDM
Wavelength-Division
Multiplexing
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