Ethernet LED Status Monitors, Test Modes

TM	Glows red to indicate that the Model 2111 has
	been placed in Test Mode. The unit can be placed in
	test mode by the local or remote user.
NS	Glow red to indicate that the local Model 2111 has
	not yet connected with the remote.

4.3 ETHERNET LED STATUS MONITORS

The Model 2111 features two LEDs that monitor general operating status and the 10Base-T twisted pair link integrity (located on the rear of the unit). Figure 5 (below) shows the LEDs located directly beneath the RJ-45 jack. Following Figure 5 is a description of each LEDs func- tion.

Quik-ConnectInterface Module

Status LED

Link LED

Interface Port

Figure 5. Model IM1/I Panel

Status Blinks yellow from one to four times to indicate system status. Each pulse pattern is separated by a 2 second “off” period. Greater pulse patterns have higher priority (buffer saturation has greater priority than an empty MAC table). Valid system statuses are:

Pulses Status

1System status ok.

2No MAC entries in the MAC address table.

3Clear to send (CTS) or Carrier Detect (CD) from base unit is not asserted.

4Bridge module buffer is saturated.

5WAN receive frame(s) too large.

6WAN receive frame(s) not octet aligned.

7WAN receive frames(s) aborted.

8Detected WAN receive frame(s) with bad CRC.

9Detected LAN receive frame(s) too large.

10Detected LAN receive frame(s) not octet aligned.

11	Detected LAN receive frame(s) with bad CRC.
Link	Glows green to indicate good link integrity on the
	10Base-T twisted pair line.

4.4 TEST MODES

The Model 2111 offers a proprietary loopback test mode, plus a built-in V.52 BER test pattern generator, to evaluate the condition of the modems and the communication link. These tests can be activated physically from the front panel.

4.4.1 Using Local Line Loopback (LLB)

The Local Line Loopback (LLB) test checks the operation of the local Model 2111, and is performed separately on each unit. Any data sent to the local Model 2111 in this test mode will be echoed (returned) back to the user device.

To perform a LLB test, follow these steps:

1.Activate LLB. Move the front panel toggle switch UP to “Local”. Once LLB is activated, the Model 2111 transmitter output is connected to its own receiver. The “TM” LED should be lit.

2.Verify that the data terminal equipment is operating properly and can be used for a test. If a fault is indicated, call a technician or replace the unit.

4.4.2Remote Digital Loopback (RDL)

Remote Digital Loopback (RDL) is not an available feature on the Model 2111.

4.4.3 Using the V.52 (BER) Test Pattern Generator

To use the V.52 BER tests in conjunction with the loopback test follow these instructions:

1.Locate the “511/511E” toggle switch on the front panel of the 2111 and move it UP. This activates the V.52 BER test mode and transmits a “511” test pattern into the loop. If any errors are present, the local modem’s red “ER” LED will blink sporadically.