Draft 02 - Sep 1 2015
8-2
Viking Mobile Radio Operating Manual
Data Features
8.2
P25 Trunking Data Services
P25 Trunking supports data service on a P25 Trunking system using an EFJohnson
Technologies radio and a portable computer. The radio communicates with the computer
over the P25 Mobile Data Peripheral (MDP) Interface, which uses an RS232 hardware
interface at 9600 bits/s. The following protocols are supported across the interface:
• Point To Point Protocol (PPP)
• Internet Protocol (IP)
• Universal Datagram Protocol (UDP)
• Transmission Control Protocol (TCP)
8.2.1
Radio Configuration
The radio must be programmed for data operations on the Trunked IV & D system. The
following parameters apply:
Data Registration On/Off
- Enables/disables data registration.
ICMP Echo
- Enables the radio to send back an ICMP response once an ICMP request
has been received.
CAI Data Max Tx Attempts
- Selects the maximum number of times the radio
attempts to send a CAI data packet. Attempts to send the data packet continue until the
radio receives an acknowledgment confirming the successful receipt of the packet, or
until the radio exceeds the selected amount of transmit attempts.
Response Timer
- Selects the period of time the radio waits for an acknowledgment
that a CAI transmission is successful before it tries the transmission again.
SNDCP Activation Wait Timer
- Controls the time that a radio waits for the KMF to
respond to a SNDCP context activation request.
Rx Voice Interrupts Data
- Enables/disables whether a voice call can interrupt data.
Subscriber IP Address
- The IP Address assigned to the subscriber for a PPP
connection.
Mobile Computer IP Address
- IP address assigned to the mobile computer for a PPP
connection.
Tx Limited Patience
- Selects the amount of time radio attempts to transmit a common
air interface packet. Once time expires, radio ceases transmission. Times are 1 to 255
seconds, infinite in increments of 1. The default is infinite.
Min Response Timer
- Selects the minimum amount of time that the radio waits for an
acknowledgement of a successful CAI to be sent across the channel. Times are 50 to
2000 milliseconds, in increments of 50 milliseconds. The default is 700 milliseconds.
