Engineering Guidelines; Available Network Card Slots; Card Mix; Address Decoding - Avaya Nortel Communication Server 1000 Reference

NT6D80 MSDL card
The flow control mechanism provides an orderly exchange of transmit and receive messages
for each operation. Each operation has a number of outstanding messages stored in buffers
waiting to be sent to their destinations. As long as the number of messages does not exceed
the threshold specified, the messages queue in the buffer in a first-in-first-out process.
If the outstanding number of messages for an operation reaches the threshold, the flow control
mechanism informs the sender to wait until the number of messages is below the threshold
before sending the next message.
If buffer space is not available, the request to send a message to the buffer is rejected and a
NO BUFFER fault indication is sent.

Engineering guidelines

Available network card slots

The number of available network slots depends on the system option, the system size, and
the number of available network slots in each module for the selected system option.
Some of these network card slots are normally occupied by Network cards, Superloop Network
cards, Conference/TDS, and others, leaving a limited number of unused slots for MSDL and
other cards.

Card mix

A system that exclusively uses MSDL cards can support up to 16 such cards, providing 64
ports. These ports can be used to run various synchronous and asynchronous operations
simultaneously.
The system also supports a mix of interface cards (MSDL, DCHI, and ESDI for example).
However, using multiple card types reduce the number of cards and ports available.

Address decoding

The MSDL card decodes the full address information received from the system. This provides
128 unique addresses. Because of MSDL ports communicate with the CPU using a single card
address, the system can support 16 MSDL cards providing 64 ports.
The MSDL card addresses are set using decimal switches located on the card. These switches
can select 100 unique card addresses from 0 to 99.
324 Circuit Card Reference
Comments? infodev@avaya.com
July 2011