ADC 150-1122-03, User Manual

Page: 10 / 76

Overview 150-454-111-06
2 February 25, 2000 HRE-454
HRE-454 List 3 and List 4
The number of spare pairs in the enclosure has been reduced from eleven to four. The reduction was implemented
to reduce the antenna effect which produces excessive Electromagnetic Interference (EMI) when too many spare
pairs are installed in one enclosure. The four remaining spare pairs are:
• Group 1
– Red and Slate
– Black and Blue
– Black and Orange
• Group 2
– Red and Brown
The four remaining spare pairs and all signal pairs are routed through ferrite coils. The coils are embedded in the
bottom of the enclosure and prevent EMI energy from escaping the pairs. In addition, the green ground wire that
previously connected the stub shield to the enclosure card cage (List 2A) has been replaced by a short copper
braided wire (see
Figure 12 on page 26 for more information). The braided wire helps to reduce the high frequency
noise in the ground plane.
The HRE-454 List 3 and List 4 enclosures have been modified to comply with the following European Union
Conformité Européene (CE) Mark requirements:
• EMI compliance: EN 55022, Class B and IEC-950
• Electrostatic Discharge (ESD) compliance and fast transients: ENC 5082-1, IEC-801-2, and 801-4
• Safety: EN 60950 and IEC 950
HRE-454 List 5 and List 6
The HRE-454 List 5 and List 6 are mainly used for housing HLU-431and HLU-432 line units. The line units have
the same 400/200 mechanics as the doubler and remote units and are used for extending T1 services over
distribution pairs that connect fiber-fed hubs to remote locations. However, instead of being line-powered over
the HDSL pairs, like doubler and remote units, the HLU-431 or HLU-432 is powered from -48 Vdc at its edge
connector on pins 17 (+) and 35 (-). The HRE-454 List 5 and List 6 are located adjacent to the hub and gain access
to the T1 payloads and -48 Vdc power over the cable stub that connects the two units. The system alarm relay
contacts from each of the four slots are also brought out through the stub. See
Table 12 on page 51 and Figure 24
on page 43 for wiring information.
Figure 1 on page 3 shows a typical HRE-454 List 5 application where it is used to extend T1 service from a
Nortel© DMS-1 Urban S100E Digital Loop Carrier (DLC) fiber-fed hub to a remote Nortel Access Node. Nortel
provides a HiGain compatible remote unit that has been integrated into the Access Node shelf precluding the need
for an externally located remote unit.