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Chapter 1: Product Description December 20, 2004
1-8 LTPH-UM-1261-01
CONNECTING TO HDSL, HDSL2, AND HDSL4 CIRCUITS
The following paragraphs provide information on making DSX-1 and HDSL, HDSL2, and HDSL4 connections to the
HMS-318 List 3 shelf.
Plug-in Connections DSX-1 and HDSL, HDSL 2, or HDSL4
DSX-1 connections to the HMS-318 List 3 shelf can be made through the HMS-318 List 3 shelf’s rear-panel 50-pin
Amphenol-type male connectors P1, RCV to DSX (labeled CO PAIR 1) and P2, XMT from DSX (labeled CO PAIR
2). HDSL, HDSL2, or HDSL4 connections to the shelf can be made through rear-panel 50-pin Amphenol-type male
connectors P3, HDSL Loop 1 (labeled SPAN PAIR 1) and P4, HDSL Loop 2 (labeled SPAN PAIR 2). All of these
connectors (P1, P2, P3 and P4) are described in the section titled “HMS-318 List 3 Rear View” on page 1-3.
Wire-Wrap Connections DSX-1 and HDSL, HDSL2, or HDSL4
DSX-1 and HDSL, HDSL2, or HDSL4 connections can be made to the individual card connectors through the HMS-
318 List 3 shelf’s rear-panel wire-wrap pins (0.045-inch square/1.14 mm). Straps for cable dressings and a
protective Lexan rear cover are provided with each shelf. Figure 1-5, Figure 1-6, and Figure 1-7 show the HLU card
slot pinouts for HDSL, HDSL2, and HDSL4, respectively on the HMS-318 List 3 shelf rear panel.
Each circuit card is identified by name and list ID (for example, HLU-319 HiGain G.703 L1). The name and list ID are
labeled on the upper portion of the front panel. All circuit cards are inserted straight into the slot, using guide pins to
align each circuit card.
ATTENTION
To ensure against damage to electronic components, ESD protection must be employed in the
handling of all circuit cards. Therefore, antistatic discharge wrist-straps should be used
whenever circuit cards are being removed or replaced. The antistatic discharge straps should be
connected to frame ground. At all other times (shipping, storage, and so forth), these circuit cards
should remain in static-shielding protective bags (for a description of card preventive measures,
see Appendix C: ”Circuit Card Preventive Measures” on page C-1).