Zhone Technologies Network Device Voice Card, Data Card, Server Card, Redundancy and Load Sharing

Zhone Technologies, Inc. IMACS Product Book, Version 4

Voice Card

The IMACS supports a wide-variety of cards to support voice channel bank applications. Typically they are a family of cards each of which provides 8 ports, which translate the analog signal to PCM and translate the signaling information from the analog interface for transmission over a digital facility. The interfaces supported include FXS, FXO, E&M, FXS Coin, FXO Coin and P-phone.

Data Card

The IMACS supports multiple types of data cards for transport of Digital Data in 2, 4, 8 or 10 port models. They include High-speed synchronous V.35, EIA530, RS449, RS422, V.1 data, low speed RS232, V.24 data, DDS traffic (Digital Data via an OCU-DP or DSO-DP) and ISDN-BRI traffic.

Server Card

The Server cards provide voice and data processing functions for WAN voice and User cards. The Server card typically provides a centralized processing function on traffic initially entering the system from User or WAN connections. The function is implemented, as a Server card when processing is needed on the data, following the termination of the physical interface layer. One example is protocol processing, where information needs to be extracted from a bit oriented protocol entering from one port, is processed, and sent out another port. The hardware function of the protocol processing is separated from the hardware required to support the physical interfaces. Traffic may arrive from time slots over a WAN link, or via an FXS card. An example is the ADPCM voice compression server card. The compressed voice data can be extracted from selected time slots of T1/E1 WAN links, and then expanded by ADPCM Server module. This can be accomplished without each WAN card having the hardware required to compress all its channels. Server cards can also be used to perform a high-speed trunking and aggregation function for the shelf. In these applications a Server card may have a high-speed cable or optical interface. An example of a high-speed aggregation function on a Server card is the ATM Server card, which has a high-speed DS3 interface. Other examples are the Frame Relay module for Frame Relay concentration, ISDN-PRI, Inverse-muxing, or Low Bit Rate Voice (LBRV).

Redundancy and Load Sharing

IMACS supports load sharing and redundancy of the following critical system modules:

•System Power Supply Unit

•CPU Card

•WAN Card

•ADPCM Voice Compression Card

Power Supply Redundancy

The IMACS Power Supply Units can support load sharing power redundancy and require the installation of two identical power supplies in the unit. The status of the power supplies is reported via LEDs that are visible through the front panel. Both IMACS power supplies load share in supplying all the power signals on a shelf. This includes 120/240 VAC, 24 VDC and -48VDC (when equipped). The IMACS power supplies are fully equipped with “ORing Diodes” on all power rails. Therefore, insertion and removal of power supplies are non-intrusive to system operation. Depending on system configuration, a single power supply can fully support the system. The main IMACS CPUs are also equipped with power supply monitoring functions. This capability enables the CPU boards to monitor the instantaneous levels of all voltages in the system. This provides immediate alarming of failed power supplies by the active CPU card.

March 2001 Page 6