Remote End Initiated LBK Tests

The U-BR1TE supports loopbacks generated from the IDSL OCU-R which allow testing to be performed without coordination with the CO or test center. Loopbacks initiated by the OCU-R front panel LBK pushbutton, aid in system turn-up testing or troubleshooting from the remote end.

The U-BR1TE responds to a loopback command initiated at the OCU-R as follows:

Pressing the OCU-R LBK pushbutton once will initiate a loopback at the U-BR1TE towards the customer. See Figure 9. This allows data to be sent from the remote end to test the local loop and the IDSL OCU-R. This loopback is indicated by a flashing CUST LBK LED on the IDSL OCU-R and a solid LBK LED on the U-BR1TE.

Pressing the OCU-R LBK pushbutton a second time initiates a loopback at the OCU-R towards the 4-wire DDS (CPE) interface. A solid CUST LBK LED on the IDSL OCU-R indicates a loopback at the IDSL OCU-R towards the customer equipment.

See Figure 10. Pressing the OCU-R LBK pushbutton a third time disables all current latching loopbacks initiated by the LBK pushbutton.

If errors exist the loopbacks can help determine the source; either the local loop or the IDSL OCU-R. During a remote end initiated loopback the IDSL/DDS system transmits ASC 9Eh towards the network, indicating an out-of-service condition generated by the remote end, as shown in Figures 9 and 10.

All IDSL/DDS system latching loopbacks, whether initiated by the IDSL OCU-R craft interface, LBK pushbutton, CO, or from a remote Test Center, may be released by sending 35 DDS loop down TIP bytes <X0111010> (Where X is a “don’t care” bit.) All existing latching loopbacks may also be disabled by pressing the LBK pushbutton on the CO or remote unit.

NOTE

The remote end test feature is only supported when the upstream U-BR1TE is an ADTRAN D4 or Series 5 U-BR1TE with DDS Loopback capability. Other U-BR1TEs will ignore the loopback command sent by pressing the IDSL OCU-R LBK button.

				4-Wire
				CPE Interface
ASC 9Eh	SLC-5		IDSL	Test
	SLC-5		OCU-R
	U-BR1TE		OCU-R
	U-BR1TE		Loopback	Set
		Local Loop		Set

			Pushbutton
			Pushbutton
			Push once for SLC-5
			U-BR1TE Loopback

Figure 9. IDSL/DDS Remote End Initiated Loopback, Local Loop

				4-Wire
		ASC 9Eh		CPE Interface
		ASC 9Eh	IDSL
ASC 9Eh			IDSL	Test
ASC 9Eh	SLC-5		OCU-R	Test
	U-BR1TE	Local Loop	Loopback	Set
		Local Loop	Pushbutton
			Pushbutton
			Push twice for IDSL OCU-R
			Loopback

Figure 10. IDSL/DDS Remote End Initiated Loopback, Customer Loop

Section 61102040L4-5, Issue 2

61102040L4-5B

SLC-5 U-BR1TE III specifications

The ADTRAN SLC-5 U-BR1TE III is an advanced digital subscriber line (DSL) technology that plays a crucial role in delivering high-speed broadband services to residential and commercial customers. As part of the SLC-5 product line, this device is designed to seamlessly support both traditional TDM and next-generation packet services, ensuring versatility and strong performance in various network configurations.

One of the key features of the SLC-5 U-BR1TE III is its ability to support multiple DSL technologies, including ADSL, ADSL2+, VDSL, and VDSL2. This flexibility allows network operators to deploy the most suitable technology based on customer requirements and available infrastructure. By utilizing these DSL technologies, the device provides enhanced data rates, allowing for increased bandwidth and better overall service quality.

The SLC-5 U-BR1TE III is known for its robust architecture, which accommodates up to 48 DSL lines per unit. This high-density capability makes it an attractive option for service providers aiming to optimize their network investments. Additionally, the unit supports various interfaces for integration within existing systems, including T1/E1 and Ethernet, making it easier to connect to core networks without significant upgrades.

Another notable characteristic of the SLC-5 U-BR1TE III is its built-in intelligence, which enables dynamic bandwidth allocation. This feature optimizes how bandwidth is distributed among subscribers to ensure equitable access and smooth service delivery, even during peak usage times. Furthermore, the device supports advanced monitoring and management capabilities, helping operators maintain network performance and address issues proactively.

In terms of deployment, the SLC-5 U-BR1TE III is designed for easy installation in diverse environments, such as central offices or remote locations. Its compact form factor and fan-less design contribute to reduced power consumption and lower operating costs, making it an environmentally friendly choice.

Overall, the ADTRAN SLC-5 U-BR1TE III is an exemplary solution for service providers seeking to enhance their DSL offerings. With its support for multiple DSL technologies, high-density capabilities, dynamic bandwidth management, and ease of deployment, it continues to be a cornerstone in the evolution of broadband connectivity, paving the way for improved user experiences and increased satisfaction.