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PN 88300150
1.9
Modem LED Indicators
The MT2834MR has fifteen LED indicators. They are:
1. Transmit Data (XMT). This LED blinks when data is being transmitted, on for a space, off for a mark.
The state of this LED matches that of the XMT circuit on Pin 2 of the RS232C interface.
2. Receive Data (RCV). This LED blinks when data is received, on for a space, off for a mark. The state
of this LED matches that of the RCV circuit on Pin 3 of the RS232C interface.
3. Carrier On (CD). This LED lights when a valid carrier tone has been detected.
4. 28,800 bps (28.8K). This LED lights when the modem is set for 28,800 bps operation. This LED
blinks slowly (1 blink per second) when the modem is set for 31,200 bps operation. This LED blinks
quickly (5 blinks per second) when the modem is set for 33,600 bps operation.
5. 24,000 bps (24K). This LED lights when the modem is set for 24,000 bps operation.
6. 19,200 bps (19.2K). This LED lights when the modem is set for 19,200 bps operation.
7. 14,400 bps (14.4K). This LED lights when the modem is set for 14,400 bps operation.
8. 9600 bps (9600). This LED lights when the modem is set for 9600 bps operation.
9. 2400 bps (2400). This LED lights when the modem is set for 2400 bps operation. If the 2400 or 9600
indicators are not on, this indicates that the modem is set for 300 bps operation.
10. Off Hook (OH). This LED lights when the phone line is "off hook." This will occur when the modem is
dialing, on line, or answering a call. The indicator will also flash when the modem is pulse dialing in
Command mode.
11. Data Terminal Ready (DTR). When the DTR LED is lit, the modem is permitted to answer an
incoming call. When it goes off, a connected modem will disconnect. The state of this LED matches that
of the DTR circuit on Pin 20 of the RS232C interface.
12. Error Correction (V.42). This LED lights when the modem is in error correction mode, and flashes on
and off when data compression is enabled.
13. Fax (FAX). This LED lights when the modem is in Fax mode.
14. Test Mode (TEST). This LED lights during test mode operation. With the optional
MultiCommManager Software installed, a full suite of modem tests can be controlled from a central PC.
Refer to the MultiCommManager Owner's Manual for more test information. The Test LED lights during
any of the software-control diagnostic tests.
15. Out-Of-Service (OOS). When the OOS LED is flashing, the leased line is down and the modem is in
dialback mode or the self-test has failed. When OOS LED is continuously lit, the modem is in busy out/out
of service (OOS) state.
Note:
The PS4800 modem rack power supply has one LED that indicates the presence of all supply
voltages.
1.10 BUSY Switch
The MT2834MR contains three two-position BUSY switches on the front panel. Each switch can be used
to create a "busy out" (OOS) condition for one of the three on-board modems (i.e., Modem A, B, or C).
To place a modem in the Busy condition, move the appropriate BUSY switch to the right. The selected
modem goes off-hook, its OOS and OH LEDs light, and incoming calls to this modem get a busy signal. If
you suspect a problem with a particular modem, you can use the BUSY switch to have an optional device
(such as a "hunt group") that looks for a non-busy line to perform a "roll over" to the next available modem
while you check the status of the Busy modem. Note: The MultiCommManager can perform the same
function using software.
4/3/01
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