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GLI 1000 • Installation 3GLI 1000 • Installation
Installation
2
Introduction
The GLI 1000 family of ground loop inhibitors (GLIs) eliminates the
hum bars and common mode noise associated with improper video
equipment grounding (figure 1). Ground loop problems can be caused
by using AC power sources with different ground levels or by plugging
high current equipment into the same power source as video equipment.
Figure 1 — Hum bars
The GLI 1000 family consists of the following four models:
• GLI 1000 5BNC — The GLI 1000 5BNC has five female BNCs on the
input and five on the output. This GLI cleans ground noise from RGB
or component video. It can also be used for one or two S-video
signals or up to five composite video signals.
• GLI 1000 15HD — The GLI 1000 15HD has a female 15HD connector
on the input and another on the output. This GLI inhibits ground
loops on VGA, XGA, and UXGA video. With an adapter cable, it can
be used for S-video signals or composite video signals.
• GLI 1000 2RCA — The GLI 1000 2RCA has two female RCA
connectors on the input and two on the output. This GLI removes
ground problems from one or two composite video signals. With an
adapter, it can also be used with S-video.
• GLI 1000 2BNC — The GLI 1000 2BNC has two female BNCs on the
input and two on the output. This GLI inhibits ground loops on
S-video. It can also be used for one or two composite video signals.
The passive, non-powered, GLIs have a 1.0 GHz (-3dB) bandwidth, and
can handle any video format. Guardrails protect the GLI connectors
from damage caused by rough handling. With optional mounting
brackets, the GLIs can be mounted to a projector mount or under a desk.
The GLIs can also be mounted to optional 1U or 2U rack panels.
Installation
Installation consists of mounting the GLI and making connections.
Rack mounting
The GLI 1000 5BNC and GLI 1000 15HD are one third of a standard rack
in width and 2U high. Up to three of these units can be mounted to the
rear of a flat 2U rack panel (figure 2) or the front of a recessed 2U rack
panel using four 6-32 x 3/8 screws.
Extron
GLI 1000 5BNC
Extron
GLI 1000 2RCA
Extron
GLI 1000 2BNC
Extron
GLI 1000 15HD
Ground Loop Inhibitor
VIDEO
/Y
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GLI 1000 2BNC
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I 1
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GLI 1000 5BNC
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GLI 1000 2RCA
Figure 2 — Rack mounting the GLI Inhibitor
The GLI 1000 2RCA and GLI 1000 2BNC are a quarter of a rack in width
and 1U high. Up to four of these units can be mounted to the rear of the
flat1U rack panel or the front of the recessed 1U rack panel.
A mix of larger and smaller GLIs can be mounted on either 2U panel, for
example, two GLI 1000 15HDs, a GLI 1000 2RCA, and a GLI 1000 2BNC.
Another example is one GLI 1000 5BNC and four GLI 1000 2BNCs.
Bracket mounting
Secure the optional mounting bracket to the GLI using four #8 machine
screws already installed in the side of the GLI. Secure the GLI to a
projector mount or other surface by inserting the mounting screw
through the bracket’s slotted hole (figure 3).
Under table mounting
1. Secure both optional mounting brackets to the GLI with eight #8
machine screws already installed in the side of the GLI (figure 4).