Patton electronic manual X.21 Ports, Connecting the 3086 serial port to a DTE, Interfaces

Model 3086 G.SHDSL Integrated Access Device User Guide 4 • Basic Application Configurations

V.35 and X.21 Ports

The serial port in the 3086 is simple to install. The V.35 interface is wired as a DCE, the X.21 interface can be configured as a DCE (factory default), or as a DTE via internal configuration jumper. The following sections describe the 3086 X.21 and V.35 port connection to DTE and DCE devices.

Connecting the 3086 serial port to a DTE

The serial port on the Model 3086 is configured as a DCE so it connects directly to a DTE using a standard straight through cable. The cable should present either a male M/34 or DB-25 connector on one end, for V.35 interfaces, or a male DB-15 for X.21 interface connection. The other end should be terminated with the appro- priate connector ( check your DTE equipment manual for pinout, gender, and DTE/DCE port configuration).

Connecting the 3086 serial port to a DCE

V.35 interfaces.

The V.35 interface in the 3086 is wired as a DCE, no DTE configuration is possible. If the equipment that the 3086 is connecting to locally does not have the option for DTE configuration, a tail-circuit cable will be required (this cable is available from most datacomm supply vendors). The tail-circuit cable will cross most interface signals, so that the DCE interface of the 3086 and the DCE interface of the third party equipment can function properly. Please be aware that some third party equipment will not be able to work properly in DCE to DCE configurations even when using a tail circuit cable (please refer to your third party equipment user manual for information on DCE-to DCE operation). The 3086 requires a cable with a male M/34 or male DB-25 connector.

X.21 interfaces.

The Model 3086’s X.21 interface configuration can be modified, by the user, as DCE (factory default) or DTE, via an internal jumper board. When the local third party equipment is configured as DCE, the Model 3086 X.21 serial port can be configured as DTE, and a regular straight through cable can then be used. Do the following to configure the X.21 port as a DTE:

1.Open the 3086’s case by inserting a screwdriver into the slots and twist the screwdriver head slightly. The top half of the case will separate from the lower half of the case (see Figure 6). Take caution not to damage any of the PC board mounted components.

Figure 6. Case being opened with screwdriver

V.35 and X.21 Ports 39