Patton electronic 1089/I

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.

5.3 TEST MODES

The Model 1089 offers a proprietary Remote Loopback test

modes, plus a built-in V.52 BER test pattern generator to evaluate the

communication status between units. Activate this test mode by tog-

gling the Test Mode Switch on the front panel of the unit.

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.

Framer The framer determines the status of the line. In

normal operation the framer transmits and

expects to receive framed packets from the far

end. If the framer receives framed packets from

the far end, the DSL Link LED will turn on. If

framed packets are not received, the DSL Link

LED will turn off. The restart procedure uses this

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 re-establish a connection

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

Pattern

Gen/Det Loop

Contr

Loop

Contro

Pattern

Gen/Det

Processor

Framer Framer

DSL

Span

Figure 8: Block Diagram Two Model 1089s Communicating over the DSL Span