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Chapter 1: Product Description December 20, 2004
1-12 LTPH-UM-1261-01
RS-232/X.25 REMOTE MANAGEMENT PORTS
Two EIA RS-232 communications ports, J26 (labeled OS RS232 PORT) and J27 (labeled AUX RS232 PORT),
located on the HMS-318 List 3 shelf rear panel (see Figure 1-9 on page 12), provide optional OS and AUX
management interfaces for connection to a HiGain system. Table 1-3 on page 1-12 lists the pin connections for the
OS communications port connector, and Table 1-4 on page 1-13 lists the pin connections for the AUX
communications port connector.
Figure 1-9. HMS-318 List 3 Shelf RS-232/X.25 Remote Management Ports
Table 1-3. J26 – RS-232/X.25 Management Port (DTE)
Note: The HMU-319 requires that Data Set Ready (DSR) be asserted by the connected Data
Communications Equipment (DCE) in order to establish communications on this port. In the HMU/HLU
configuration, the HMU-319 always asserts Data Terminal Ready (DTR) on this port.
Pin No. Signal Direction
1Shield —
2 Transmit Data (TD) Out
3 Receive Data (RD) In
4 Request to Send (RTS) Out
5 Clear to Send (CTS) In
6 Data Set Ready (DSR) In
7 Ground (GND) —
15 TCLK In
17 RCLK In
20 Data Terminal Ready (DTR) Out
24 TCLK In
J27
J26
OS RS232 PORT
AUX RS232 DTE PORT
13-1261R1
10 BASE-T
10 BASE-2
-48VA -4 8V B BAT RTN
12345
FGND
FUSEFUSE
P INS 3 & 4
MUST BE BRI DGED
15 A MAX 15 A MAX
SPAN PAIR 1
25 1
26
50
CO PAIR 1
25
1
2650
CO PAIR 2
25
1
26 50
SPAN PAIR 2
25
1
26
50