ADTRAN 239 T1 HDSL4 - Manual (Page 10)

4 61223445L1-5D
Description 239 H4R Installation and Maintenance Practice
Compatibility
The 239 H4R is used in conjunction with any T1.418 compliant span powering H4TU-C and H4TU-R. Compatible
ADTRAN HDSL4 transceiver units are listed in
Table 1 .
Due to span power limits, the number of H4Rs permitted in the circuit depends upon the type of H4TU-C utilized.
An ADTRAN 239 H4R provides DS1 transport on all revised resistance design (RRD) 26 AWG and/or 24 AWG
loops. Three ADTRAN 239 H4R repeaters may be added to extend the range of a loop.
Repeater placement is determined by the following criteria:
• On single H4R loops, only on the attenuation properties of the loop segment must be considered.
• For a circuit requiring two H4Rs, both segment attenuation as well as segment DC resistance requirements be
satisfied.
• For a circuit requiring three H4Rs, H4TU-C and H4TU-R hardware requirements, segment attenuation, and
segment DC resistance requirements must all be satisfied.
Refer to the “HDSL4 Deployment Guidelines” on page 6 of this practice and the Installation and Maintenance
Practice for the deployed H4TU-C.
Compliance
Table 2 shows the compliance codes for the 239 H4R. The 239 H4R is NRTL listed to the applicable UL standards.
The 239 H4R is to be installed in a restricted access location and in a Type “B” or “E” enclosure only.
Table 1. ADTRAN Unit Compatibility
Part Number Unit Name
118141xLy Total Access 3000 H4TU-C
122x401Ly 220 H4TU-C
122x403Ly DDM+ H4TU-C
122x404Ly 3192 H4TU-C
122x407Ly Soneplex H4TU-C
122x424Ly T200 H4TU-R, Local Power
122x426Ly T200 H4TU-R, Span Power
x = any generic number; y = any list number
Table 2. Compliance Codes
Code Input Output
Power Code (PC) C C
Telecommunication Code (TC) X
Installation Code (IC) A –