Skip to main content

Need Help Using Spok Knowledge?

Internet Explorer is not supported. Please reload in Chrome, Edge, Firefox, or Safari.
Spok

Spok Messenger Gateways: Pocsag

Pocsag is the digital protocol used to send messages to pagers. The Gateway generates Pocsag signals to interface to an external transmitter through the use of a dongle. The function of the dongle is twofold. It provides an interface to Pocsag transmitters, and it is used as the security device for Spok Messenger. Multiple Pocsag Gateways may be installed on a single Spok Messenger system. In this case, all messages sent via a Pocsag Gateway are transmitted to all Pocsag Ports. It is not possible to send messages to a particular Pocsag Gateway. Pocsag Gateways are configured by selecting the Interfaces > Pocsag option from the main menu.

Exactly one Pocsag Gateway per Pocsag Port is defined, and hence all Pocsag Ports appear in the leftmost panel of the Pocsag Gateways screen. As such, there is no ability to add and delete Pocsag Gateways – they are automatically created and deleted with Pocsag Ports. If no ports appear in this panel, you need to define at least one port to use the Pocsag protocol.

Pocsag speed

Refers to the baud rate of the signal sent to pagers. It may be 512 or 1200 bits per second, and depends on the setting with which your pagers have been programmed, but is normally 512.

Power up time

The time in milliseconds that the Push To Talk (PTT) signal is asserted before data modulation begins. This parameter can normally be left as default, but may need to be set to meet the timing requirements of your Pocsag transmitter.

Power down time

The time in milliseconds that the PTT signal remains asserted after the completion of data modulation. It should normally be left as default.

Sync time

The number of Pocsag batches that may be sent without retransmitting preamble for resynchronization of pagers. It should be left at the default setting unless otherwise instructed.

Messages per sync

The maximum number of messages that are sent without retransmitting preamble for resynchronization of pagers. If you are having problems with message corruption then trying low values e.g. 1, 2, or 3 may fix some issues.

Presets

Allows default settings to be selected for a list of standard transmitters. Clicking this button pops up a little menu which gives a choice of transmitters whose default preset settings can be chosen. Note that this only affects certain default fields, it does not entirely configure the gateway for any specific use.

Exclusive

Causes this Pocsag Gateway to transmit only when no other Pocsag Gateways are transmitting. Use this setting for Pocsag transmitters on the same frequency with overlapping coverage areas to avoid RF interference problems. If this option is not set, the Gateway transmits simultaneously with all other Gateways that do not have the Exclusive option enabled.

PTT invert

Changes the polarity of the Push To Talk output signal to suit certain transmitters when checked.

Data invert

Changes the polarity of the Data output signal to suit certain transmitters when checked.

Ignore busy

Disregards any channel busy signal from the transmitter. If the Pocsag transmitter supports a Channel Busy signal, this option should not be set, in order to ensure that Spok Messenger only transmits when there is no other traffic on the radio channel.

Busy invert

Changes the way the polarity of the busy input signal is interpreted to suit certain transmitters when checked.

Transmitter test

Causes the output data signal to oscillate at the Pocsag speed. This setting is used for testing only and should not be used in normal operation.

Max msg length

Sets the longest message that can be sent through Pocsag Gateways. Messages longer than this is either be truncated or split, depending on the setting. This setting affects all Pocsag Gateways.

Threshold

Sets the size of the outgoing message queue threshold.

Split long messages

Causes messages longer than the maximum message length setting to be sent as separate sequential messages for all Pocsag Gateways.

Ports enabled

Allows Pocsag transmissions through all Pocsag Gateways when checked. It should be enabled for normal operation.

 

Adding a Pocsag Gateway

A new Pocsag Gateway can be added.

  1. Choose Interfaces > Pocsag. The Pocsag dialog displays.
  2. Click New. The fields can be edited.
  3. Enter desired information for the new gateway into the fields.
  4. Click Save. The new gateway is saved to the system.

 

Editing a Pocsag Gateway

An existing Pocsag gateway can be edited.

  1. Choose Interfaces > Pocsag. The Pocsag Gateways dialog displays.
  2. Select the gateway to be edited from the list. The fields populate with the information for that gateway.
  3. Edit desired information in the fields.
  4. Click Save. The changes to the gateway are saved.

 

Deleting a Pocsag Gateway

An existing Pocsag Gateway can be deleted.

  1. Choose Interfaces > Pocsag. The Pocsag Gateways dialog displays.
  2. Select the gateway to be deleted from the list. The information for that gateway displays in the fields.
  3. Click Delete. A confirmation dialog displays.
  4. Click Yes to delete the gateway.