Hdsl4 Deployment Guidelines; Figure 2. Hdsl4 Circuit Segments - ADTRAN 239 H4R Installation And Maintenance Manual

4. HDSL4 DEPLOYMENT GUIDELINES

NOTE
The H4TU-Cs (P/Ns: 1221401L6, 1221403L6,
and 1221404L6) support only one H4R in the
HDSL4 circuit.
The different segments of an HDSL4 circuit are
defined in Figure 2.
H4TU-C 1st H4R
1st Segment 2nd Segment

Figure 2. HDSL4 Circuit Segments

According to the number of H4Rs in the HDSL4
circuit, the following service ranges apply:
• HDSL4 circuit containing no H4Rs will reach up
to 16 kft on the local loop (24 AWG)
• HDSL4 circuit containing one H4R will reach up
to 16 kft on the first segment and 15 kft on the
second segment (24 AWG)
• HDSL4 circuit containing two H4Rs will reach to
13.5 kft on the first segment, 14 kft on the second
segment, and 15 kft on the third segment
(24 AWG) *
*This is one example of a circuit with 2 H4Rs.
Other loop length configurations are possible in
compliance with loop resistance restraints.
6
2nd H4R H4TU-R
3rd Segment
Section 61221445L1-5, Issue 1
Refer to the H4TU-C or H4TU-R Installation
and Maintenance Practice, HDSL4 Deployment
Guidelines section, for other loop parameters
including Insertion Loss and Pulse Attenuation.
The ADTRAN HDSL4 system provides DS1-based
services over loops designed to comply with the
guidelines given below.
1. All loops are nonloaded only.
2. Any single bridged tap is limited to 2 kft.
3. Total bridged tap length is limited to 2.5 kft.
NOTE
Refer to the Detailed Status Screen (Main Menu
selection "3," Span Status selection "1") for the
current loop SNR Margin, Insertion Loss, and
Pulse Attenuation status.
NOTE
61221445L1-5A