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61223445L1-5D 1
239 T1 HDSL4 Repeater (H4R)
1. GENERAL
This practice is an installation and maintenance guide for the ADTRAN
®
239 T1 HDSL4 Repeater (H4R) (239
H4R). Figure 1 illustrates the 239 H4R (P/N 1223445L1) front panel.
Figure 1. HDSL4 239 T1 HDSL4 Repeater (H4R)
2. DESCRIPTION
HDSL4 provides extended range T1 (DS1) transport on the telecommunications network. HDSL4 features spectral
compatibility with ADSL and other transport technologies.
This 239 H4R performs signal regeneration to extend the range of the HDSL4 circuit.
The H4TU-C (Central Office Transceiver) unit receives DSX-1 input signals from the network through the chassis,
transports them across the HDSL4 circuit, and terminates them through an H4TU-R remote unit which provides a
traditional DS1 to customer equipment. The H4TU-C provides testing, provisioning, and performance monitoring
capabilities that address circuit status.
The H4TU-C works in conjunction with the ADTRAN H4TU-R (Remote) and up to three H4Rs (Repeaters) to
provide a DS1 service on the local loop.
239 H4R
1223445L1
LP1
NET
LP2
LP1
LP2
LL RL
(Y) (G)
/
CUST