Service Interface (Line) Cards 5-3
ASI-1, ATM Service Interface Card
Features
A summary of features for the ASI card include:
• Two 45 Mb T3 ATM UNI/NNI ports per card for connection of user devices.
• Allows connections between UNI ports on a single node, between nodes, and NNI connections
between networks.
• Maximum of 1000 connections per card.
• Aggregate transport rate of 96,000 cps per port (T3) or 80,000 cps (E3).
• VCC and/or VPC addressing.
• Ingress to ASI, each PVC is assigned a separate input queue.
• Egress from ASI, sixteen fixed queues per line, including CBR, VBR, and ABR queues.
• Optional 1:1 card redundancy using Y-cable configuration.
Functional Description
Each ASI-1 card provides two ATM UNI/NNI ports, each operating at DS3 rates or E3 rates (see
Figure 5-2). Any of the 12 general purpose slots can be used to hold these cards. The ASI-1 operates
with a corresponding T3 or E3 Line Module back card LM-2T3 or LM-2E3, respectively. Only the
first two connectors on the back card are active; the lower port is not used.
Figure 5-2 ASI-1 Simplified Block Diagram
Each port provides an aggregate ATM connection bandwidth of 96,000 cells/second (T3)
or 80,000 cells/sec (E3), or 353,208 cells/sec (OC3).
Connections are added using the addcon command.
DS3 #1
DS3 #2
Ingress
Egress
StrataBus backplane
H8155
Serial
interface
module
Control
&
admin.
Cell
queues
Cell
service
DS3 port logic, PLPP
Address
translation
Rate
control
Queues UPC
