Product description 23
Nortel Integrated Conference Bridge Service Implementation Guide
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.