5.2 LOOP (V.54 & TELCO) DIAGNOSTICS

The NetLink-T1ª offers three V.54 loop diagnostics and is com- patible with two Telco loop diagnostics. Use these diagnostics to test the CSU/DSU and any communication links. These tests can be acti- vated via the software control port (See Section 3.2.3 System Diagnostics), via signals on the serial port interface or the front panel switch.

5.2.1 Operating Local Loopback (LL)

The Local Loopback (LL) test checks the operation of the local

NetLink-T1ª, and is performed separately on each unit. Any data sent to the local NetLink-T1ª 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 three ways:

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

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

c.Toggle the front panel switch to the ÒLocalÓ position.

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. If the BER test equipment indicates no faults, but the data terminal indicates a fault, follow the manufactur- erÕs checkout procedures for the data terminal. Also, check the interface cable between the terminal and the NetLink-T1.

5.2.2Operating Remote Digital Loopback (RL)

The Remote Digital Loopback (RL) test checks the performance of both the local and remote NetLink-T1ª, as well as the communication link between them. Any characters sent to the remote NetLink-T1ª in this test mode will be returned back to the originating device (i.e, char- acters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote NetLink- T1ª and looped back).

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To perform an RDL test, follow these steps:

1.Activate RDL. This may be done in three ways:

a.Enter b Remote Loop from the System Diagnostics/Statistics menu and toggle the <Spacebar> until ÒRLÓ appears next to the b Remote Loop option.;

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

c.Set the front panel switch to ÔRemoteÕ.

2.Perform a bit error rate test (BERT) using the internal V.52 generator (as described in Section 5.3), or using a separate BER Tester. If the BER test indicates a fault, and the Local Line Loopback test was successful for both NetLinkªs, you may have a problem with the twisted pair line connection.

5.2.3CSU Loop

The NetLink-T1ª also responds to central office initiated loop com- mands. The NetLink-T1ª will implement the Òloop upÓ command when it recognizes the pattern Ò10000Ó in the data stream for a minimum of 5 seconds. The Òloop downÓ command is implemented by the pattern Ò100Ó in the data stream for a minimum of 5 seconds.

When operating in ESF framing mode, loopback commands are issued via the Facility Data Link (FDL). The line loop message will cause a loop back before data enters the framer portion of the CSU. The payload loop message will cause the NetLink-T1ª to loop data after the framer portion of the CSU.

The NetLink-T1ª will respond to Universal Loopback De-activate to clear all central office loops.

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Patton electronic 2720/I Series user manual Loop V.54 & Telco Diagnostics, Operating Local Loopback LL, CSU Loop
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2720/I Series specifications

The Patton Electronic 2720/I Series is a cutting-edge solution designed for businesses seeking reliable and high-performance network connectivity. This series provides a range of features tailored to meet the demands of modern telecommunications, making it ideal for both enterprises and service providers.

One of the standout features of the 2720/I Series is its ability to support multiple protocols, making it versatile for various networking environments. It supports both E1 and T1 interfaces, facilitating seamless integration with different types of communication lines. This adaptability ensures that users can maintain a consistent and efficient communication system, regardless of their existing infrastructure.

The 2720/I Series incorporates advanced technologies that enhance its performance and reliability. Notably, it features robust error detection and correction capabilities, which are essential for preserving data integrity during transmission. This is particularly important in business applications where data loss or corruption can have significant repercussions.

Security is another critical aspect of the 2720/I Series. With built-in encryption support, it ensures that sensitive data remains protected during transit. This makes the series suitable for organizations that handle confidential information and prioritize security in their communication channels.

The 2720/I Series also stands out with its user-friendly management interface. Administrators can easily configure and monitor the devices through a web-based interface, simplifying the management process and minimizing downtime. This intuitive design allows for quick adjustments and troubleshooting, which is vital for maintaining optimal network performance.

Power over Ethernet (PoE) capability is another significant feature of the 2720/I Series. This technology allows the device to receive power through the same cable used for data transmission, reducing clutter and simplifying installation. The ability to deliver power to remote devices enhances the deployment flexibility and efficiency.

In terms of physical characteristics, the 2720/I Series is designed for durability and reliability. It is housed in a rugged casing that can withstand various environmental conditions, making it suitable for deployment in challenging environments.

Overall, the Patton Electronic 2720/I Series combines versatility, reliability, and advanced technology, making it a valuable asset for any organization looking to enhance its communication infrastructure. Its robust features and user-friendly management capabilities make it a preferred choice for managing complex networking challenges effectively.
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