A Hi-Bit Rate Digital Subscriber Line (HDSL) Unbundled Loop 2-Wire is a loop facility extending from the Central Office Distribution Frame (MDF) to the End User Customer Premises Network Interface Device that is compatible with HDSL technology. At this time, HDSL Compatible 2-Wire Loops are provisioned only over 2-wire copper facilities that meet certain design criteria. The facilities must be within the maximum loop length established and meet other HDSL requirements.

This unbundled network element is provisioned from the end user's address to either a physical collocation node in the central office or to a virtual collocation arrangement in the serving central office.

The Unbundled HDSL loop provides an effective 2-wire channel (single loop operation) that provides transport for bi-directional full duplex 784 Kbps digital signals that support a 768 Kbps payload plus framing (8 Kbps) and overhead (8 Kbps). The data rate achieved depends upon the performance of the CLEC-provided modems with the electrical characteristics (length, bridged tap, noise, etc.) associated with the loop.

HDSL Loop Limitations

• The cable shall be non-loaded.
• The total of all bridged tap length shall not exceed 2.5 kft.
• The total length of a cable consisting entirely of 26 gauge plus the total bridged tap length shall not exceed 9 kft.
• The total length of a cable consisting entirely of 19, 22, or 24 gauge cable or a mixed gauge cable plus the total bridged tap length shall not exceed 12 kft.
• HDSL is not included in Wholesale Advantage/EEL offerings.
• HDSL Compatible Loops cannot currently be provisioned over facilities where DLC/Remote Terminals are connected to customer premises.

The CLEC interface at the Central Office Distributing Frame (CODF) termination for the loop is 2-wire and the interface at the end user point of termination (EU-POT) is also 2-wire. If a single circuit network interface device (NID) is provided at the end user point of termination, and RJ11C connector will be used.

For further information, please review the Unbundled Digital Loop Technical Specifications document.

DSL Premise Service is a Wholesale Markets product offer that allows a DLEC to contract with Verizon Network Services for an additional level of support for DSL service delivery at the end user customer premise. DSL Premise Service allows a DLEC to order the dispatch of Verizon technicians to install CPE at the end user customer premise. Work preformed may include some or all of the following: Installation of microfilters, splitter, inside wire and jack, and external modems.

Beginning February 20, 2002, the IOSCs submitted in the SAN field of Line Share LSRs for the DSL Premise Service will change. For LSRs submitted prior to February 20, 2002, DLECs should have used the IOSCs 80600 and 87053. After February 20, 2002, DLECs should substitute IOSC 67585 for IOSC 80600 and IOSC 67586 for IOSC 87053. All other rules will apply as prior to the February 20 date.