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
24
25
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
