60 Configuring PAD/ATPAD Ports
ATPAD Ports
Network Parity
Application
The application that the network parity feature has been designed for is as follows.
An async device is directly connected to the ATPAD, and a call is made to an X.25
host. The ATPAD port currently strips parity on the incoming async data, so that the
data on the X.25 link is always 8 bits, no parity. Normally, the PAD at the remote site
would regenerate parity when it transmits the data. In this application, the connection
is to an X.25 host, which is expecting the data to be 7 bits, even parity.
This enhancement allows for selection of the parity requirements for data
transmission. This configuration is shown in Figure 12.
Figure 12. ATPAD Application Environment
Response Delay
If it is necessary to slow down the responses sent by an ATPAD port, you can
configure Response Time using this CSK:
BSYJWMYCCCKK6HE9NKEE
. This
CSK causes all ATPAD ports on the node to delay sending responses to commands
for a period of 1 second.
This feature is designed for this situation. If an automated device that you are using
to send commands to an ATPAD port has trouble recognizing the responses when
they arrive too quickly, this feature will delay responses. This feature is not
recommended when the commands are being issued by a human operator.
Note
The ATPAD does not have type-ahead capability, so commands that are sent
before the response to the previous command has been received are ignored.
DTR Timeout
The standard timeout period for DTR Connection Type is 1.5 seconds. This means
that DTR is not recognized as being in the OFF state until it has been OFF for a
continuous period of 1.5 seconds. If you need a shorter timeout period, you can
configure it using this CSK:
DTZEFG4JHTQY2HCFBJ66
.
This CSK will change the timeout period for all ports on the node with DTR
Connection Type to 100 ms. To guarantee reliable operation in this mode, a
minimum OFF time of 150 ms for DTR is recommended.
Async X.25
8 Bits, No Parity
PC
Network
Access
Product
7 Bits
Even Parity
X.25
Host
