Nortel Networks 555-4001-135, 553-3001-358 manual ICB hardware design characteristics

Product description 23

ICB hardware design characteristics

Each ICB card occupies one slot in a Media Gateway chassis slot (CS 1000) or an IPE shelf (Meridian 1/CS 1000/CS 2100/SL-100). ICB Release 4 is based on a new hardware platform. The ICB card has the following hardware interface characteristics:

•uses the microprocessor unit (MPU) based on the 50MHz MPC 860P Power Quad Integrated Communications Controller

•uses standard interface buses and personal computer memory card international association (PCMCIA) cards and handles files that are compatible with MS-DOS operating system on the PCMCIA storage device and formatted with fat 16 file system. The fat 32 file system is not supported.

•uses 4MB flash memory for boot purposes

•accesses all 32 DS-30X voice/signaling timeslots

•provides echo cancelling and volume control

•users 128 KB SRAM memory for saving trap data during resets

•emulates an M2616 digital telephone set on each ICB port

•supports Card-LAN interfaces

•performs X12 signaling protocol messages for input/output

•uses digital signal processor (DSP) for conferencing and DTMF detection

•provides the drivers for the new hardware through the MPU firmware

•The DSP firmware:

—Provides DTMF tone detection.

—Provides for A-law and u-law conversion.

—Provides the functionality for the conference bridge.

—Downloads the code from the MPU.

—Communicates with the MPU.

—Analyzes the loudness off all received signals continuously and selects the two loudest signals to be the active speakers.

—Handles two-way conversation in conferences with three to 62 conferees.

—Normalizes the pulse code modulation (PCM) input samples.

—Provides gain control on all output samples.

—Provides software upgrades using a PCMCIA Flash card.

Nortel Integrated Conference Bridge Service Implementation Guide