COMSPHERE 3900 Series Modems
3-4 September 1998 3910-A2-GN32-40
The standalone Model 3910 modem’s DCP has 13 light-emitting diodes (LEDs), and the
carrier-mounted Model 3911 has 16 LEDs. These LEDs are listed and described in Table 3-1.
LEDs specific to one model type have the appropriate model number shown in the table.
Table 3-1
Model 3910 and Model 3911 DCP LEDs
Label Color Indicates
Pwr green Power has been applied to the modem.
Alrm red Flashing. A major alarm has been detected in a remote 391x Series modem.
ON. A major alarm has been detected in the local modem. (For Health and
Status alarm conditions, refer to Table 4-1 in Chapter 4, Status Branch.)
Diag
(3910 only) green The modem is receiving diagnostic communications (either a command or a
status poll).
Test/142 yellow Flashing. The modem is involved in a firmware upgrade. Normal operation is not
possible.
ON. The modem is involved in a test. Normal operation is not possible.
OFF. The modem is not involved in a test or firmware upgrade.
Dial yellow Flashing. The modem is attempting to establish a call over the dial network, or
the modem is in Dial Standby mode.
ON. The modem has established a dial connection.
OFF. A dial connection does not exist.
RI/125
(3911 only) green A ringing signal is being received.
Busy
(3911 only) yellow The modem is placed in a forced busy condition and is off-hook.
Serv
(3911 only) yellow The modem is connected to the carrier service line rather than the normally
assigned network.
SQ yellow The receive telephone line signal is degraded or the modem’s data path has
been blocked (SQ flashes).
TXD/103 green The modem is receiving data from the DTE to transmit. (ON equals space.)
RXD/104 green Data is being transferred to the DTE. (ON equals space.)
RTS/105 green RTS signal is ON.
CTS/106 green CTS signal is ON.
DSR/107
(3911 only) green DSR signal is ON.
DTR/108 green The DTE has turned ON DTR or the modem has forced DTR ON.
LSD/109 green The modem has detected a valid carrier signal and is capable of transferring
data to the DTE.
Rate
(3910 only) yellow ON. The modem is connected at a data rate lower than the data rate it is
configured for.
OFF. The modem is connected at its configured data rate.
Front Panel
(3911 only) yellow The modem is connected to the carrier’s SDCP.