Extron electronics CrossPoint 124, Руководство пользователя

Страница: 36 / 68

Operation, cont’d
CrossPoint Plus Matrix Switchers • Operation 3-16
Rear Panel Controls
The CrossPoint Plus matrix switchers all have sync termination switches on the
rear panel for inputs 1, 3, 5, and 7 on the CrossPoint Plus 168 and 1616 models and
inputs 1 through 4 (figure 37) on the CrossPoint Plus 84, 88, 124, and 128 models.
The switches provide a way to condition non-TTL sync levels greater than 5Vp-p,
enabling the sync to be properly passed from input to selected output(s). The
matrix switchers have two sets of sync termination switches; one for horizontal or
combined sync and a second set for vertical sync.
16
15
16
CrossPoint
168 and 1616
CrossPoint
84, 88, 124, and 128
INPUTS
75
1 2 4 3
INPUTS
75
1 2 4 3
1 3 5 7
1 3 5 7
Figure 37 — Rear panel sync termination switches
Each switch provides the option of selecting either 510 ohms or 75 ohms. The
75 ohms position is required only for an input with non-TTL sync, greater than
5V p-p. The normal position is 510 ohms.
An input that produces an out of sync display, a display that is rolling
vertically and/or tearing horizontally, could indicate a non-TTL sync input. A
device that is known to output non-TTL sync levels (greater than 5V p-p)
should be connected to one of the inputs with sync termination switches, and
the switches for that input should be set to the 75 ohm position. If you’re not
sure, check the specifications in the user’s manual for the input device.
Worksheets
Rather than trying to remember the configuration for each preset, use worksheets
to record this information. Make copies of the blank worksheets on page 3-19 and
use one for each preset configuration. The forms accommodate all of the
CrossPoint Plus models. Cross off all unused or inactive inputs and outputs. Use
different colors for video and audio.
Worksheet example 1: Entering system equipment
Figure 38 shows a worksheet for a CrossPoint Plus 128 HVA in a fictional
organization with the system hardware annotated. Inputs 10 and 11 and output 7
have no connections in this organization, so they have been crossed out on the
worksheet. On this example, preset 3 is used for the weekly status meeting.
Choose your own method of notation.