Warnings and Notes
122 7705 SAR-M Chassis Installation Guide
Warnings and Notes
Danger:
• Only trained and qualified personnel should install or replace this equipment.
• Invisible laser radiation can be emitted from an optical port aperture when no cable is
connected. Avoid exposure and do not stare into open apertures.
Warning:
• Electrostatic discharge (ESD) damage can occur if electronic components are
mishandled. Always wear an ESD-preventive wrist or ankle strap and always connect
an ESD strap to a nearby ground point that is connected to the site grounding point
when working on the 7705 SAR-M. Typical ground points include the ground connection
point on the 7705 SAR-M left-hand side mounting bracket (but only after the
7705 SAR-M is installed and the chassis ground wire has been connected), the
grounding stud on the 7705 SAR-M right-hand side mounting bracket, or a properly
grounded rack or work bench.
• Always place components on an anti-static surface.
• Use only approved small form-factor pluggable (SFP) fiber-optic devices in a
7705 SAR-M.
Caution: When a T1/E1 port, that is configured for T1, is connected to external equipment
or is in physical loopback, ensure that the external equipment’s transmit signal is attenuated
according to the distance of the T1/E1 port receiver. Adjust LBO settings such that the
T1/E1 port receiver’s nominal input voltage level is < 3Vp. Refer to “Configuring T1 Line
Buildout” in the 7705 SAR OS Interface Configuration Guide for detailed information on
attenuating transmit signals.
Note:
• Services cannot be configured until the ports are configured.
• Ensure that cables are dressed such that they do not impede the insertion or removal
of other equipment in the rack.
• To maintain EMC compliance, cables that are shielded and grounded at both ends must
be used with interface connectors.
• To meet surge protection requirements, the cable shield for any open-ended cables
must be grounded by attaching the shield to a convenient chassis ground point, using
hardware suitable to provide a solid electrical and mechanical connection. In addition,
ensure that there is sufficient strain relief to remove any mechanical strain on the ground
connection due to cable movement.
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