User's Guide

COMSPHERE 3821Plus Modem
1-2 February 1998 3821-A2-GB20-30
• Storage of up to 10 telephone numbers to directory
locations.
• Originate Security and three Answer Security
modes.
• Callback Security with telephone directory index or
telephone number.
• Two factory-defined configurations and two
user-defined configuration areas.
Status Indicators
The status indicators on a 3821Plus circuit card
continuously provide information on the modem’s
operating condition. The status indicators for the
3821Plus card are located on its faceplate, the SDCP, and
the Shared Diagnostic Unit (SDU) faceplate (Figure 1-1).
The 3821Plus card has 13 Light Emitting Diodes
(LEDs). These LEDs are listed and described in Table 1-1.
Select
SDU12345678910111213141516
COMSPHERE 3000
SELECT
KEY
STATUS
INDICATORS
CARRIER SLOTS 1–16
F1 F2 F3
OK Alarm BckUp Test EC
NETWORK
DEVICE
ALARM
DIAL
BACKUP
TEST
MODE
ERROR
CORRECTION
OK Alarm BckUp Test EC
KEYPAD
LCD
496-14802-0
1
OK
Alrm
In
Out
Status
SDU
Diag
Diag
3821 Plus
TXD
RXD
CD
RI
DTR
OH
Mod
Mod
Mod
Status
Front Panel
A
B
C
Alrm
Alrm
Alrm
A
B
C
Figure 1-1. Optional SDCP, 3821 Plus Faceplate, and Optional SDU