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December 20, 2004 Chapter 1: Product Description
LTPH-UM-1261-01 1-3
HMS-318 List 3 Rear View
The HMS-318 List 3 shelf input power, 5-position terminal block (labeled TB1) and the alarms (labeled Alarms) wire-
wrap connections are located on the rear panel (see Figure 1-2). The Bonding (Safety ground) is located on the
upper right corner extension of the right panel. The label (BONDING WIRE MIN #10 AWG) is located on the right
corner of the rear panel (see Grounding Lug and Hexhead Screw, Figure 1-2).
Managed HDSLx configuration
Also located on the rear panel, connectors P1 and P2 (labeled CO PAIR 1 and 2) are DSX-1 receive and transmit
connections. Connectors P3 and P4 (labeled SPAN PAIR 1 and 2) are HDSL Spans (Loops 1 and 2) receive and
transmit connections (see Figure 1-2). All of these plug-in connectors (P1, P2, P3, and P4) are 50-pin Amphenol-
type male connectors and provide Tip and Ring for all the cards in the shelf. For information on the signal and pin
assignments, see Appendix A: ”Signal and Pin Assignments” on page A-1.
LoopStar™ (LPS-300C) Power Module configuration (for Wi-Fi)
Also located on the rear panel (for Visual & Audible Alarm Contact operation, install an HMU-319), connectors P1
and P2 (labeled CO PAIR 1 and 2) are xDSL B and A IN transmit and receive connections, respectively. Connectors
P3 and P4 (labeled SPAN PAIR 1 and 2) are xDSL A and B OUT transmit and receive connections, respectively
(see Figure 1-2). All of these plug-in connectors (P1, P2, P3, and P4) are 50-pin Amphenol-type male connectors
and provide Tip and Ring for all the cards in the shelf. For information on the signal and pin assignments, see
Appendix A: ”Signal and Pin Assignments” on page A-1.
Table 1-1 on page 1-4 provides a description of each rear-panel component.
Figure 1-2. HMS-318 List 3 Shelf - Rear View
J
24
J
25
J
27
Connector (P2)
Grounding Lug
and Hexhead Screw
Connector (P1)
Connector (P4)
Connector (P3)
Input Power
Terminal Block
(T 1)B
J26
J23
OS RS232 PORT
CO PAIR 2
AUX RS232 DTE PORT
CO PAIR 1
SPAN PAIR 1
SPAN PAIR 2
02A-1261R1
10 BASE-T
10 BASE-2
-48VA-48VBBATRTNFGND
1234
5
Alarms wire-wrap
field (TB2)
J22
J1