LTPH-SM-1052-04
Appendix B - HMU Configuration for X.25 and Ethernet Connections
HMS-358 List 5 and List 6
July 14, 2002
79
Additional X.25 Parameter Configuration
In addition to PVC and SVC, the following additional X.25 parameters may be modified. The default settings are
indicated in parentheses.
These parameters display on the X.25 Management screen, Line Parameters (option A) selected. Accessing these
parameters is similar to accessing PVC and SVC (see
“X.25 Parameter Configuration” on page 78
Ethernet Port Configuration Procedure
The Ethernet port (J34 for 10BASE-T and J32 for 10BASE-2 on the rear of the Wideband 3190) may be used in
either Interactive Mode or NMA Mode. Unlike the X.25 port, the operating mode of the Ethernet port is not
configured by the user, but is determined by the TCP port opened by the client application.
The following table shows the TCP port number and the operating mode.
The HMU cannot operate both 10BASE-T and 10BASE-2 simultaneously. The user must use the Craft screens
through the HMU serial port to select the appropriate physical interface. (Refer to the HMU-319 User Manual,
document LTPH-UM-1086-xx, for a detailed Ethernet configuration procedure.)
Setting
Default
Max frame size
(142)
Layer 2 Restart Timer
(180)
Layer 2 Window Size
(7)
Acknowledge Timer
(5)
Number of Max Retransmit Attempts
(10)
If these parameters are not properly configured or do not match the equipment settings on the
other end of the X.25 connection, the performance of the HMU will be adversely affected.
Only knowledgeable personnel should attempt to configure these parameters.
TCP Port Number
Operating Mode
TCP Port 23
Interactive Mode
TCP Port 42462
NMA Mode
