Patton electronic 2715, 275 user manual Los, Alm, Err, Tst, Pwr, Loop V.54 & Telco Diagnostics

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LOS

The Loss of Sync LED lights when the unit

 

loses synchronization with the incoming sig-

 

nal. This may happen when there is a fram-

 

ing mismatch or a loss of signal. In

 

unframed mode, the LOS LED monitors the

 

status of the transmit clock.

ALM

The alarm LED indicates the presence of a

 

AIS or RAI, or Out of Frame condition. The

 

ALM LED will blink on every half-second.

 

Alarms may occur due to:

 

Loss of Synchronization

 

• Loss of Frame

 

• AIS (Blue Alarm)

 

• RAI (Yellow Alarm)

ERR

The error LED indicates various error condi-

 

tions, including framing bit errors, excessive

 

zeros, controlled slips, severe errors, or bit

 

errors (when sending V.52 test patterns).

 

When sending a test pattern, the LED will

 

remain lit if the unit does not receive the

 

identical pattern. When it receives the cor-

 

rect pattern, the LED will turn off. If error

 

insertion is on, the LED will blink once a

 

second if everything is operating properly.

TST

The test indicator LED blinks with a specific

 

pattern depending on the type of test mode.

 

When the unit is in local analog loop, the

 

LED will blink on briefly. When the unit is in

 

remote loop, the TST LED will blink off

 

briefly. When the unit is sending a test pat-

 

tern or is putting the remote unit into V.54

 

loopback, the TST LED will stay on. These

 

are the test modes:

 

• V.54 Loopback & V.52 Patterns

PWR

The power indicator LED will remain lit while

 

the unit is powered. It turns off when the

 

unit is not powered.

5.2 LOOP (V.54 & TELCO) DIAGNOSTICS

The Model 2715 offers three V.54 loop diagnostics. Use these diagnostics to test the NTU and any communication links. These tests can be activated via the software control port (See Section 3.2.3 System Diagnostics) or via signals on the serial port interface.

5.2.1 Operating Local Loopback (LL)

The Local Loopback (LL) test checks the operation of the local Model 2715, and is performed separately on each unit. Any data sent to the local Model 2715 in this test mode will be echoed (returned) back to the user device (i.e., characters typed on the keyboard of a ter- minal will appear on the terminal screen).

To perform a LL test, follow these steps:

1.Activate LL. This may be done in one of two ways:

a. Enter a Local Loop from the System Diagnostics/Statistics menu and toggle the <Spacebar> until “LL” appears next to the a Local Loop option.

b.Activate the “LL” signal on the DTE. If you are not sure which lead is the “LL” signal, please refer to Appendix D.

2.Verify that the data terminal equipment is operating properly and can be used for a test.

3.Perform a V.52 BER (bit error rate) test as described in Section 5.3.3. If the BER test equipment indicates no faults, but the data terminal indicates a fault, follow the manufactur- er’s checkout procedures for the data terminal. Also, check the interface cable between the terminal and the Model 2715.

5.2.2Operating Remote Digital Loopback (RDL)

The Remote Digital Loopback (RDL) test checks the performance of both the local and remote Model 2715, as well as the communica- tion link between them. Any characters sent to the remote Model 2715 in this test mode will be returned back to the originating device (i.e, characters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote Model 2715 and looped back).

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Contents User Manual Warranty Statement Patton Model Table of ContentsGeneral Information Service Information Radio and TV InterferenceCE and Telecommunication Approvals Tel 301 Email support@patton.comFeatures General Product DescriptionSupported Applications 2715 as the Interface between the Telco and CPEConfiguration DIP Switch ConfigurationSwitch SET Summary Table Switch SW1 Line CodingMULTIFRAMEG.704 CRC-4 MFUnframed G.703 SW3 SW4 Clock ModesSoftware Configuration Introduction to Main Menu Helpful HintsLine Format G.703 default Options G.703, G.704 System ConfigurationLine Coding HDB3 default CRC-4 Setting Disabled default Options Enabled, Disabled CAS MF Setting Disabled default Options Enabled, Disabled54 Loops Enabled default Options Enabled, Disabled Default Config Source Switch default Options EEPROM, SwitchSystem Diagnostics Local Loop Idle defaultRemote Loop Idle default Test Pattern Idle default Options Idle or SendingError Insertion Off default Options On, Off SpacebarCurrent DIP Switch Settings PasswordNI Status Unit OptionsDTE Interface Connection Network Interface ConnectionPower Connection LED DescriptionsTXD RXDLoop V.54 & Telco Diagnostics LOSALM ERRBIT Error Rate V.52 Diagnostics Error Insertion to on511 2047Specifications Patton Model Cable RecommendationsAppendix C DB9FConnector, Terminal Interface Patton Model Power Supply InterfaceJumper Position for Power via DC Power Jack default Jumper Position for Power via Pin KKCopyright Patton Electronics Company All Rights Reserved