
Appendix — Network Infrastructure Checklists
A-8
Hewlett-Packard VPN Server Appliance SA3110/SA3150/SA3400/SA3450 Installation Guide
Provide the types of cables and connectors it requires in the
following table.
Note:
Note:
Note:
Note: To select the correct adapter cable, you must know
whether the VPN device is being connected to a DTE or DCE
device (see next section).
Adapter Cable
Adapter Cable
Adapter Cable
Adapter Cable
Devices that communicate over serial devices are either Data
Terminal Equipment (DTE) or Data Communications
Equipment (DCE) devices. DCE devices supply the clock signal
to pace the communications.
The VPN device is itself a DTE device. Follow these rules to
choose which type of adapter cable to use, and see the following
illustration:
•
If connecting the VPN device to a Data Service Unit/
Channel Service Unit (DSU/CSU device with a DCE
interface, use a DTE adapter cable.
•
If connecting the VPN device to a DSU/CSU device with
a DTE interface, use a DCE adapter cable.
•
If you connect the VPN device in frame relay bridge
mode, it connects a frame relay device (having a DTE
interface) with a DSU/CSU (having a DCE interface).
Connectors or Cables
Connectors or Cables
Connectors or Cables
Connectors or Cables
Required?
Required?
Required?
Required?
Yes/No
Yes/No
Yes/No
Yes/No
V.35 serial interface for Frame
Relay
X.21 serial interface for dedicated
leased lines
DTE or DCE adapter cable