Warnings and Notes
222 7750 SR-a4 and SR-a8 Installation Guide
Warnings and Notes
Danger: 
• Fiber-optic equipment can emit laser or infrared light that can injure your eyes. Never 
look into an optical fiber or connector port. Always assume that fiber-optic cables are 
connected to a light source.
• CFP and QSFP+ pluggable optic modules are very hot while in use. Touch only the 
captive screws when removing the module. Allow the module to cool before further 
handling.
Warning: 
• Make sure that the safety cap on the transceiver is inserted while you install or remove 
the SFP, SFP+, CSFP, CFP, or QSFP+ transceivers. Only remove the safety cap when 
you are ready to attach network cables.
• Always replace the dust cover when the SFP, SFP+, CSFP, CFP, or QSFP is removed.
• Use only approved small form factor pluggable (SFP) and compact form factor 
pluggable (CFP) fiber-optic devices in MDA-a ports.
• Before using the optics, verify that the optical path is in compliance with the parameters 
of the optical components. In particular, verify any minimum attenuation requirements 
for the optics. If minimum attenuation requirements are not met, the optical receiver 
components may be permanently damaged. 
• Electrostatic discharge (ESD) damage can occur if router components, including SFP, 
SFP+, CSFP, CFP, and QSFP+ transceivers are mishandled. Always wear an ESD-
preventive wrist or ankle strap and always connect an ESD strap to the grounding plug 
on the front of the chassis.
Caution: 
• Always place router components on an antistatic surface.
• Avoid bending fiber-optic cable beyond its minimum bend radius.
• Do not exceed the recommended minimum bend radius for fiber-optic cables. AT&T TP-
76450 specifies 1.0 in. (25.4 mm) inside radius for single fibers.
Note: 
• Discard SFP, SFP+, CSFP, CFP, and QSFP+ transceivers according to all local laws 
and regulations.
• SFP, SFP+, CSFP, CFP, and QSFP+ transceivers can be installed and replaced 
without disabling the interfaces.
• SFP, SFP+, CSFP, CFP, and QSFP+ transceivers are keyed to prevent incorrect 
insertion.