Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT6D70 SILC Line card

The reset and sanity timer logic resets the MCU.

The serial control interface is an IPE bus used by the MPU to communicate 
with the S/T transceivers.

The IPE interface logic consists of a Card-LAN interface, an IPE bus 
interface, a maintenance signaling channel interface, a digital pad, and a clock 
controller and converter.

The Card-LAN interface is used for routine card maintenance, which includes 
polling the line cards to find the card slot where the SILC is installed. It also 
queries the status and identification of the card and reports the configuration 
data and firmware version of the card.

The IPE bus interface connects an IPE bus loop that has 32 channels 
operating at 64 kbps and one additional validation and signaling bit.

The Maintenance Signaling Channel (MSC) interface communicates 
signaling and card identification information from the system CPU to the 
SILC MCU. The signaling information also contains maintenance 
instructions.

The digital pad provides gain or attenuation values to condition the level of 
the digitized transmission signal according to the network loss plan. This sets 
transmission levels for the B-channel voice calls.

The clock recovery circuit recovers the clock from the local exchange.

The clock converter converts the 5.12-MHz clock from the IPE backplane 
into a 2.56 MHz clock to time the IPE bus channels and an 8 kHz clock to 
provide PCM framing bits.

The S/T interface logic consists of a transceiver circuit and the DSL power 
source. This interface supports DSLs of different distances and different 
numbers and types of terminal.