Symptom | Possible Cause | Recommendations |
|
|
|
Not receiving data; | H DDS line rate has | 1. Verify that your subscriber loop is |
DSU is not | changed | running at 56 kbps or |
responding. | H Excessive BPVs | 64 kbps CC. |
|
| |
| H Excessive loop loss | 2. Run Loopback tests. Refer to |
|
| Chapter 4, Testing, in the User's |
|
| Guide. |
|
| 3. If network testing exposes |
|
| excessive BPVs, verify that you |
|
| do not have a bad cable. If the |
|
| |
|
| cable is good, contact the |
|
| network service provider. |
|
| 4. If network testing exposes |
|
| excessive loop loss, install a |
|
| higher quality cable. Refer to |
|
| Appendix B, Technical |
|
| Specifications, in the User's |
|
| Guide. |
|
|
|
The Test LED does | The remote unit failed to | Check the remote unit. If it has a |
not light up when | acknowledge the | V.54 Sequence Detection |
you attempt to start | V.54 Loop Up command. | configuration option, verify that it is |
a Remote Digital |
| enabled. |
Loopback; the RL |
|
|
LED turns off. |
|
|
|
|
|
An LED is not lit. | LED is burned out. | While the DSUs are not in use, |
|
| cycle power to the card by pulling it |
|
| slightly out of the carrier then |
|
| replacing it. If the LED in question |
|
| does not flash with the other LEDs, |
|
| contact your service representative. |
|
|
|
The Test Mode | Switch | Move Switch |
switch has no effect. | position. | |
| use only and may affect the |
|
| DSU's behavior. |
|
|
|
|
Unexpected | Switch settings are | Ensure that switches on the circuit |
behavior in general. | incorrect. | card are fully on or fully off as |
|
| appropriate for your application. |
|
|
|
!Important Safety Instructions
1.Read and follow all warning notices and instructions marked on the product or included in the manual.
2.Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to protect it from overheating, these slots and openings must not be blocked or covered.
3.Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the power cord.
January 1999 | 13 |
