Drake MEQ1000A ASII ASI Input Module - Manual (Page 10)

This section provides additional details regarding the
selectable items shown in the ‘adjust’ mode on the
Software Flow Chart on page 8.
SETUP: MEQ1000
(For Specific EAS and DTA Settings, Refer to Page 14)
UNIT ID: Select the desired unit identification number when
connecting the 'RS232 IN' connector to a PC or modem for
remote control using 'Drake Remote Control Software'.
Numbers 1 thru 63 may be used. If zero (0) is selected, the
PC will ignore the unit.
RS232 BAUD RATE : This setting determines the baud
rate at which the MEQ1000 communicates with the remote
PC. Settings available are 2400, 4800, 9600 and 19,200.
All units 'daisy chained' to the remote PC or modem must
be set to the same baud rate.
MULTIPLEX: This setting determines whether the Input
Module Slot A input is to be multiplexed with a second
input (if installed). Select Input Module Slot A to activate the
A Input Module only. Select Input Module Slot B to activate
the B input module only. To turn on the multiplex function
select ENABLED. If either A or B Input module is selected,
the next menu will be the QAM MODE menu. You may skip
to that paragraph, below.
INPUT B OFFSET: W hen the Input Module Slot B or ASI
input has been installed and selected in the MULTIPLEX
menu, this menu will be present. Because the two incoming
transport streams are likely to have overlapping use of
MPEG program numbers, the MEQ1000 will pass the
program numbers from input A unchanged and an offset,
equal to the value chosen in this menu, will be added to the
program number of programs from the second input. This
same offset value will also be added to the minor channel
number in the VCT table for programs from the second
input source. Usually an offset of 10 will be adequate but if
you know there are programs in the signal input to input A
using program numbers above 10, a higher offset may be
required. Values between 10 and 90, in increments of 10,
are available for selection. W hen it is known that there is
no overlap between input A and input B stream program
numbers, a 0 offset setting can be used. Be cautious if this
is the selection that is chosen.
MPEG PROGRAMS: This menu provides selections to
determine which programs are multiplexed to form the new
multiprogram transport stream output that will be supplied
to the QAM modulator section. Choose the SELECT ALL
PROGS setting to multiplex all programs from inputs A
and B up to 20 programs maximum. If more than 20 exist,
you must use SELECT PROGRAMS and only select 20
maximum.
It is the operator's responsibility to be sure that the total
data rate of these programs does not exceed the maximum
data rate for the output QAM mode that will be used,
typically 26.98 Mbps for 64QAM or 38.8 Mbps for 256QAM
in ITUB modes. If the sum of input bitrates would exceed
this amount, or if more than 20 programs are present,
some programs will have to be dropped from the list of
selected programs.
Choose the SELECT PROGRAMS setting to allow the
operator to pick which programs from the A and B inputs are
to be included in the output multiplex.
NOTE: At this point you may proceed through the remaining
menus, below, before pressing the ENTER button to load the
selected data OR you may press ENTER now and then come
back to the rest of the menus. In any case, when the ENTER
button is pressed, one of the following two actions will occur:
A) If SELECT ALL PROGS has been selected, the MEQ1000A
will now read PAT tables from the two input streams and dis-
cover which MPEG programs are defined. If you wish to view
the MPEG program numbers of programs that were found, fol-
low the procedure below:
VIEWING MPEG PROGRAM NUMBERS
In order to see the MPEG program numbers of incom-
ing streams, the following procedure can be followed:
1) Press the ENTER button for 2 seconds to enter pro-
gram mode. Release button. Display will be flashing.
2) Press the ENTER key again and hold. By continuing
to hold in the ENTER button, the following display will
be slowed down so that program numbers can be read
as they scroll by.
3) A screen will be displayed that indicates:
PMT PROG A xxxx or PMT PROG B xxxx.
4) The xxxx field will be a number that corresponds to
the MPEG program number of a program found in the
PMT table for the indicated (A or B) input. As the button
is held, all entries for input A will scroll past and then
entries for input B will scroll past.
5) Release button and if necessary repeat steps 1 - 4.
B) If SELECT PROGRAMS was chosen, the unit will read
the PAT tables from both inputs and then display:
MPEG PROG XXXXX: (XXXXX is a number from 00001 to
65535) on the top line of the display. Using the right and
left arrow keys, you can scroll through all 65535 possible
program numbers.
Don't be alarmed by the large number of possibilities
because if the arrow key is held down, the scrolling will
speed up so all 65535 possible numbers can be scanned in a
short time - any time an entry is found at a given program
number, the scrolling will slow down to give the operator time
to see it and stop scrolling, if desired. Usually, all programs
are known to be numbered between 01 and 20.
For each MPEG program number, displayed on the top line,
the bottom line, on the right, will indicate A, B, AB, or nothing.
This will indicate that the program number on the top line was
found in input A or B or AB for both or not in either one if
blank.
To select programs to be included in the output multiplex,
use the up and down arrow keys to select NOT SELECTED,
INPUT A, INPUT B, or INPUT A+B. If NOT SELECTED is
used, then this program number will not be present in the
output and any programs with this program number that are
present in the A or B inputs will be filtered out. If INPUT A is
selected, the A input program only is used.