Configuring the Nuance Text Processing Engine service
The Nuance Text Processing Engine (NTpE), is the normalization and tokenization (or lexical analysis) engine. NTpE applies transformation rules and formats output for display or for further processing by semantic engines.
Note: NTpE is packaged with a self-signed certificate and pre-configured to enable secure connections using TLS/SSL. You can use the self-signed certificates for testing and development, but for a secure production environment you need to acquire a certificate signed by a Certificate Authority (CA), and a PEM-formatted private key. Then configure the properties described below under SSL settings (WSS).
Management Station displays commonly-used properties on the Settings tab, and the following tables shows some of these properties. (Management Station does not display less-common parameters, but you can add them to the display at any time. For a complete list, see Speech product parameters.)
General settings
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Port on which NTpE listens for incoming WebSocket requests. |
INT | 9092 |
Linguistic model settings
Use these properties for any linguistic models used by your application.
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Maximum number of application models that can be loaded in the process memory. Determine this number from the number of models and the amount of available RAM. Each model requires approximately 100-150 MB of RAM. |
INT | 100 | |
|
Name of one or more data packs. For example:
To specify multiple data packs, use a comma-separated list. |
STRING | ||
|
Trace log level. Note: Do not change unless instructed by Nuance. |
STRING | error | |
|
Specifies how often NTpE cleans up downloaded and installed unused application models. The interval is expressed in minutes. |
INT | 30 | |
|
Specifies the drift tolerance (in seconds) between client and server hosts for security verification purposes. Based on difference in UUID timestamps, with a valid range of 1-120 seconds and default value of 2 minutes. |
INT | 120 |
Logging settings
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Logging level for the NTpE session: error, warn, info, verbose, debug, or silly. The Management Station default logging level is STATUS, and it overrides this default value. |
STRING | error | |
|
Path to the log file directory |
STRING | ./logs | |
|
Filename of the log file. |
STRING | service_ | |
|
Maximum log file size in bytes. |
INT | 5242880 | |
|
Maximum number of log files. |
INT | 5 |
Licensing setting
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
| Licensing setting | |||
|
Port and IP address of the Nuance License Manager, using the format: port@ip_address |
STRING | 27000@localhost | |
Resource Manager settings
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Enables NTpE to publish its capabilities to the Resource Manager during startup. |
BOOLEAN | ||
|
IP address (or hostname) and port (usually 9001) of the Nuance Resource Manager. |
STRING | ||
|
IP address or hostname of the machine running NTpE (this machine). This property is used by Resource Manager to identify an NTpE resource |
STRING | ||
|
Time to wait before attempting to reconnect to Resource Manager. Default is 5 seconds. |
INT | 5000 |
HTTPS client settings
Use these properties to control how NTpE behaves as an HTTPS client. For example, to send its digital certificate and private key to NLE to download application linguistic models.
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Requests and verifies a certificate from clients that try to connect to via HTTPS. |
BOOLEAN | false | |
|
When the service acts as a client, this property requires servers to be authorized by valid certificates. |
BOOLEAN | false | |
|
When httpClient : rejectUnauthorized is true, list of certificates to validate the certificates of an HTTPS resource. |
STRING |
SSL settings (WSS)
|
Service property |
Description |
Data type |
Default |
|---|---|---|---|
|
Enables SSL/TLS communications. |
BOOLEAN | true | |
|
Path and filename of a private key. |
STRING | ./keys/server.key | |
|
The encrypted passphrase for the service's private keyfile. Optional. When you acquire a TLS certificate and private key, run the startEngine command-line tool to obfuscate your TLS passphrase. Then copy/paste the output as the value of this parameter. See Securing connections with SSL/TLS. |
STRING | ||
|
Path and filename of the signed certificate file for NTpE. |
STRING | ./keys/server.crt | |
|
Requests and verifies a certificate from clients that try to connect to via HTTPS. |
BOOLEAN | false | |
|
When the service acts as a client, this property requires servers to be authorized by valid certificates. |
BOOLEAN | false |
Related topics
Related tasks
Securing connections with SSL/TLS
Related topics
