# CG boards

CG series boards provide the following features:

- Up to 16 T1 or E1 (75 or 120 ohm) network interfaces for digital trunk connectivity through a rear transition board (you must configure the board for T1 or E1 operation).

- Full support of the H.110 bus specification, which allows boards to share data with other boards on the H.110 bus.

- Telephony bus switching for a total of 256 full duplex connections between local devices and the H.110 bus. Switch connections are allowed between local devices and are non-blocking.

- Two 10/100 Base-T Ethernet connections for Fast Ethernet connectivity to IP networks. CG board Ethernet interfaces can be configured to use an on-board IPv4
  stack, to use an on-board IPv6
  stack, or to run in dual IPv4 and IPv6 mode.

- Up to 96 high-performance digital signal processor (DSP
  ) cores that provide resources for universal IP gateway ports. The functionality provided by these processors depends on the resource management configured for the board.

The port densities supported by specific Fusion configurations vary according to the number and types of DSP resources the system requires.

## Universal ports

CG boards can support up to 360 simultaneous universal ports of voice and fax data. A universal port can use any combination of loaded functions, such as voice play, voice record, tone detection, tone generation, T.38 fax, or voice encode and decode functions. Applications can also switch between these functions within a single phone call.

A universal port consists of two full duplex complex vocoders, one simple vocoder (simple vocoders use algorithms that achieve a lower level of compression and require less processing resources than complex vocoders.), T.38 fax, echo cancellation, and various call control functions such as DTMF detection, and cleardown tone detection. G.711 is the only available simple vocoder. All other vocoders (G.729A, G.723.1, G.726) are considered complex. By definition, a universal port runs on a single DSP core (there are two DSP cores per DSP chip).

Specific universal port capabilities are determined by the resource management setup for the CG board and universal port densities can vary based on the number of T.38 fax ports running on the system. For more information about resource management, refer to the CG board documentation. For more information about port densities with T.38 fax, refer to the readmefusion.txt file.

For Fusion applications, each universal port can support the following resources:

- Up to two complex voice vocoders (vocoders that perform encoding and decoding for voice algorithms such as G.723.1, G.729A, and G.726)

- One simple voice vocoder (such as G.711)

- T.38 fax processing

- PSTN call control processing

Universal ports enable the application to process voice and fax data during the course of a single call, without being concerned with the board resources needed to perform the processing activities. However, when vocoders are loaded, only one encoder/decoder pair can be active at any given time per channel.

## Resource management

CG boards use an on-board resource manager that allocates and loads board DSP resources based on configuration information specified through a board keyword configuration file.

For detailed information about CG board resource management
, refer to the CG board documentation.