P
AGE
6
44214-0898 <90-00005>
Adjust the XMT LEVEL, at the bottom of the front panel, until
the meter reads -6dBm.
Adjust the receive level
Connect a 600 ohm load across the output of a signal generator.
With a 600 dB meter across those same outputs, adjust the
output level of the generator until the meter reads -29 dBm, at
1004 Hz.
Remove the meter and the 600 ohm load from the generator.
Connect the generator to the 44214. Connection can be made at
either of two places. A mini-plug can be inserted into the front
panel jack labeled 2W LINE or the meter can be connected to
the 44214’s edge connector at pins 41 and 42.
Connect the dB meter, unterminated, to the pinjacks on the
front panel. These are labeled RCV and GND.
Adjust the RCV LEVEL, at the bottom of the front panel, until
the meter reads -20 dBm.
Remove the meter and the generator.
C
HECKOUT
P
ROCEDURE
Follow the Alignment Procedure to set the levels. If, at any point
in the alignment, the unit fails, the module should be replaced.
When performing the checkout procedure described below, take
appropriate precautions to avoid damaging the unit. Wear an
ESD wriststrap, and make sure it is grounded. Every time the
procedure requires that the module be removed from the shelf or
replaced in the shelf, remove power from the entire shelf.
RTS/DTR
Remove power and set JP4 to ACT. Replace the module and
restore power. The front panel DTR LED will illuminate. Re-
place JP4 to position NA. The DTR LED will remain off.
Remove power and set JP5 to ACT. Replace the module and
restore power. The front panel RTS LED will illuminate. Re-
place JP5 to position NA. The RTS LED will remain off.
Analog Loopback (ALB)
Set S6-1 on, and the rest off. This enables the RS232 portion of
the modem. Connect a dumb terminal to the RS232 port. Refer
to Figure 1. Edge connector pin 21 is the transmit into the
44214. Pin 14 is the receive back to the dumb terminal. Use
pin 17 or 25 for signal ground.
Set ALB, on the front panel, to ON. After a delay of 5 seconds,
the front panel RTS, DTR, CD, and CTS LEDs will come on.
Typing on the keyboard will cause the TD and RD LEDs to blink
and the characters to be echoed back on the screen.
LINE
MON
LINE
MON
TD
RD
RTS
CD
DTR
CTS
2W
XMT
4W
XMT
RCV
LEVEL
GND
ON
OFF
ON
OFF
ORG
ANS
RCV
RST
ALB
DLB
44214-00 REV__
44214-00
9600 BPS MODEM
F
IG
. 2 - F
RONT
P
ANEL
V
IEW
N
OTE
:
During normal operation, the an-
alog loopback function is used to
test the facility between the mo-
dem and the DTE device connect-
ed to the modem. The ALB func-
tion can also be activated by ap-
plying a signal ground to edge
connector pin 47.
CONTINUED
. . .
INSTALLATION
