InterTalk’s radio endpoints are known as Radio Line Interface (RLI) cards. InterTalk’s current generation of RLI cards support up to four (4) radio interfaces, known as Quad Line Interface (QLI) cards. Each interface can be 2 or 4-wire, with local PTT/COR control, and/or E&M signaling. Each of the four ports on the QLI is independent of the others, and all keying tones, paging tones, MDC-1200, GE Star, DTMF and other signaling is generated on a per-port basis utilizing advanced Digital Signal Processing (DSP) techniques. The codec used by the InterTalk System components, QLI inclusive, is G.711 μLaw compandered, providing an MOS quality of 4.0 or better.
InterTalk’s QLI Card has one RJ-45 Ethernet connector that supports 10/100baseT connection. The network protocols used are standard TCP/IP and UDP/IP that route through IPv4 equipment. The QLI can operate in parallel with existing equipment, allowing a seamless transition from legacy to new systems.
The QLI Cards use standard PCI-style card edge connectors that are rated for more than 200 insertions. Each QLI Card is equipped with its own switch-mode power supply regulators and transient protection devices to ensure excellent isolation from external environmental electrostatic discharge and power fluctuations.
The QLI utilizes a powerful DSP micro-controller to independently process both incoming and outbound audio across all four ports. The DSP processor generates outbound keying and alert tones, as well as paging sequences. Incoming signaling is decoded by the DSP, and Automatic Gain Control (AGC) level adjustment is applied.
Each port possesses a 2-wire output comprising the summation of the input and output audio paths with or without signaling. The output is designed to interface with a 3rd party archival recorder. Nominal level is -10 dBm, and can be adjusted by a System Administrator.
InterTalk’s QLI Cards run an embedded distribution version of the Linux operating system (uClinux™). uClinux™ provides the ability to remotely view all card parameters, including the current status of the application, card health, and remote maintenance and diagnostics by the System Administrator or technician.
RJ-45 Ethernet Port
PCI-style card edge
Digital Signal Processing (DSP) micro-controller