DS0 DP Loopback EOC Remapping

Upon receipt of subsequent DS0 DP loopback codes when the D channel is disabled, the U-BR1TE V remaps the subsequent DS0 DP loopback sequences into the respective ISDN EOC loopback messages. This capability will permit all downstream ISDN D channel enabled U-BR1TEs, U-Repeaters, and TRISDN elements to respond to standard DDS DS0 DP loopback commands via the ISDN EOC as shown in Figure 8.

Test
Head
D4/SLC-96
U-BR1TE	T1	U-BR1TE	ISDN	IDSL
1B		1B+D	RPTR	OCU-R
DS0 DP #1		DS0 DP #2	DS0 DP #3	OCU
		Loopback	Response

Figure 8. IDSL/DDS Loopback Response

NOTE

For DDS circuits with the D channel disabled, all tandem U-BR1TE elements should be ADTRAN U-BR1TE Vs with DDS Loopback Capability for remote end test operation to function properly. See 2B in Figure 7. In D channel disabled applications, older non-DDS vintage U-BRITEs may not pass the OCU latching loopback sequence to the IDSL OCU-R.

Upon receipt of an OCU latching loopback sequence the U-BR1TE V passes the OCU sequence in-band downstream to the IDSL OCU-R. U-BR1TE Vs do not respond to the CSU latching loopback command but simultaneously pass it through to the CSU/DSU while mapping the NT1 EOC address. The IDSL OCU-R reverses sealing current on its 4-wire AMI DDS interface to place the customer CSU into loopback upon receipt of the CSU latching loopback.

The following data sequence enables the DS0 DP, OCU, and CSU latching loopbacks:

1.Minimum of 35 transition in progress (TIP) bytes (X0111010).

2.Minimum of 35 loopback select code (LSC) bytes: DS0 DP (X0000101),OCU (X1010101), CSU (X0110001).

3.Minimum of 100 loopback enable (LBE) bytes (X1010110).

4.Minimum of 32 far-end voice (FEV) bytes (X1011010).

X Denotes Don’t Care bit - either a 1 or a 0.

If the U-interface of the U-BR1TE V is not in sync, the unit transmits MUX-Out-of-Sync (X0011010).

Disabling DS0 DP, OCU, or CSU latching loopback sequence:

1.Minimum of 35 TIP bytes.

or by pressing the front panel loopback button.

Front Panel Tests

The valid front panel tests in leased modes are ADR1, CRTX, LPTX, and LPBK for all circuit positions. NT1, ADR1-ADR6 loopback tests are valid for the LULT mode only. ADR2 would be used to test a U- Repeater or ADR2 and ADR3 would be used to test TRISDN elements respectively.

All active in-band loopbacks may be disabled by pressing the front panel loopback button once when a test set is not connected to the bantam jacks.

Initiate Loopback at IDSL OCU-R

When used for DDS, the D4 U-BR1TE may initiate a loopback at the IDSL OCU-R. The in-band latching OCU loopback code is sent to loop the IDSL OCU-R when the NT1 address is selected on SW2. To invoke the OCU loopback at the IDSL OCU-R, press the Test button with the front panel test knob in the NT1 address location.

61104020L4-5C

Section 61104020L4-5, Issue 3

D4 U-BR1TE V specifications

ADTRAN D4 U-BR1TE V is a state-of-the-art broadband networking solution designed to support next-generation services with a focus on reliability, flexibility, and high-speed connectivity. As telecommunications companies strive to meet the ever-increasing demand for bandwidth, the D4 U-BR1TE V stands out as a powerful tool that enables service providers to deliver superior services to their customers.

One of the main features of the ADTRAN D4 U-BR1TE V is its versatility in deployment options. This device can be used in various environments, including central offices, remote locations, and outdoor settings. It supports multiple access technologies, such as VDSL2, ADSL2+, and Ethernet, allowing operators to choose the best technology for their specific needs. This flexibility ensures that service providers can efficiently leverage their existing infrastructure while expanding their service offerings.

The D4 U-BR1TE V is equipped with advanced vectoring technology that significantly reduces crosstalk interference, thereby enhancing the overall performance and capacity of DSL connections. This allows operators to extend the reach of their broadband services while delivering higher speeds to end-users. Alongside vectoring, it incorporates G.fast technology, enabling ultra-fast broadband speeds over short copper lines, making it ideal for dense urban areas or multi-dwelling units where bandwidth demand is highest.

In addition to its robust performance capabilities, the ADTRAN D4 U-BR1TE V is designed with operational simplicity in mind. It features an intuitive graphical user interface that streamlines management and monitoring tasks, reducing the burden on network operations teams. Furthermore, its support for cloud-based management platforms allows service providers to automate network monitoring and troubleshooting, ensuring high service levels and quick resolution of issues.

Another notable characteristic of the D4 U-BR1TE V is its scalability. Service providers can easily expand their network by adding additional units as demand grows, ensuring that they can meet the future needs of their customers without extensive overhauls or infrastructure upgrades.

In conclusion, the ADTRAN D4 U-BR1TE V represents a significant advancement in broadband technology. By combining flexibility, high performance, and ease of management, it empowers service providers to deliver enhanced broadband experiences to their customers while efficiently managing their network resources. With its comprehensive feature set and future-proof capabilities, it is an essential component for operators seeking to stay competitive in the increasingly demanding telecommunications landscape.