User's Manual

zNID 27xx Installation
42 zNID 27xx Series Hardware Installation Guide
Manage the optical cable
When making a fiber optic connection, avoid touching the fiber cable ends to
the outside of the mating connector. Touching can contaminate the
connectors.
Fiber handling
Before making any connections, be sure that the optical cable fiber tips and
components are clean and free of dust and debris.
The zNID fiber tray provides fiber spools and hooks to avoid sharp bends in
the fiber cable. A minimum bend radius of 30 mm is recommended for
stripped fiber and larger fiber needs a larger bend radius to guarantee the
specified system performance.
Note: Sharp bends in fiber cables create undesirable optical
attenuation or loss.
Testing optical power
Table 6 specifies how much laser power to expect on the fiber.
Table 6: Optical values for zNID-GPON-27xx
Parameter 1490 nm
(Data Downstream)
1550 nm
(RF Downstream)
Damage Level +5 dBm +5 dBm
Optical Overload -8 dBm +2 dBm
Maximum Usable — +2 dBm
Minimal Optical Signal -28 dBm -8 dBm
Mid Range Optical Value -17 dBm -4 dBm
Table 7: Optical values for zNID-GE-27xx
Parameter Active Ethernet
Damage Level +5 dBm
Optical Overload -2 dBm
Minimal Optical Signal -23 dBm
Mid Range Optical Value -12 dBm