Digicom Model 3910 and Model 3911 DCP LEDs, Label Color Indicates Pwr, Alrm, Diag, Test/142

COMSPHERE 3900 Series Modems

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	green	The modem is receiving diagnostic communications (either a command or a
(3910 only)		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	green	A ringing signal is being received.
(3911 only)
Busy	yellow	The modem is placed in a forced busy condition and is off-hook.
(3911 only)
Serv	yellow	The modem is connected to the carrier service line rather than the normally
(3911 only)		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	green	DSR signal is ON.
(3911 only)
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	yellow	ON. The modem is connected at a data rate lower than the data rate it is
(3910 only)		configured for.
		OFF. The modem is connected at its configured data rate.
Front Panel	yellow	The modem is connected to the carrier’s SDCP.
(3911 only)

3-4 September 1998 3910-A2-GN32-40