7 pulses | = WAN receive frame(s) aborted |
8 pulses | = Detected WAN receive frame(s) with |
| CRC |
9 pulses | = Detected LAN receive frame(s) too large |
10 pulses = Detected LAN receive frame(s) not octet aligned
11 pulses = Detected LAN receive frame(s) with bad
CRC
10BT Link (Active Green) Solid green indicates that the
| 10BaseT Ethernet interface has detected a valid |
| SQE heartbeat, signifying a valid 10BaseT con- |
| nection. |
NS | (Active Red) Solid red indicates that the Digital |
| Signal Processors (DSPs) are not linked. |
ER | (Active Red) Flashing red indicates CRC Errors on |
| DSL (Framer) side if DSL Link is active or if bit |
| errors are received during loop/BER test. |
| - ER flashes once to indicate a CRC error (during |
| normal operation) or bit errors (during Remote |
| Loopback 511/511E tests). |
TM | (Active Yellow) Solid Yellow indicates an Active |
| Test Mode. The unit may be placed in test mode |
| by the local user or by the remote user. |
13
5.3 TEST MODES
The Model 1089 offers a proprietary Remote Loopback test modes, plus a
5.3.1 Overview
Figure 8 below shows the major elements used in the loop-back and 511 pattern tests available in the Model 1089. Each block has sev- eral functions. Following Figure 7 are descriptions of the elements dur- ing Test Modes.
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information to determine if a valid connection is made (cable disconnect, poor cable quality, etc). In normal Data Mode, if the box receives 4 sec- onds of unframed packets it will restart the box and begin trying to
with the the remote Model 1089. The distinction between framed packets and unframed packets becomes important when we discuss the Pattern Generator.
Pattern Gen/Det This part of the Processor generates and detects the 511/511E patterns. When transmit- ting 511 patterns, the information is unframed
14
