Hardware Specifications Hardware Configuration and Overview of Functions
Centillion 1200N ATM Switch User Manual 4-7
NTP 297-8103-903
Functional Blocks
A functional description of each functional block in the line card is shown in the
following table.
Hardware Block Description of Functions
Line card PHY ■Conversion of physical media
(e.g., E/O conversion, O/E conversion)
■Reception clock recovery
■Transmission clock generation
■Frame termination
■Cell alignment
■Speed conversion
■Line loop-back control
MUX ■Cell multiplexing/demultiplexing of multiple PHY
■Cell loop-back control
ALT ■SSO (Switch Specific Overhead) generation
(reception side)
■Cell header conversion (transmission side)
■Policing control
■Flow monitor (e.g., passing cell count)
■OAM function (Fault Management)
IXB ■Cell storage buffer (32K cell buffer)
■QoS five-class (CBR, rt-VBR, nrt-VBR, ABR, UBR)
■Two-class cell loss priority control
■EPD (Early Packet Discard)
■BP (Back Pressure) reception control
■Congestion notification control
OXB ■Cell storage buffer (32K cell buffer)
■QoS five-class (CBR, rt-VBR, nrt-VBR, ABR, UBR)
■BP (Back Pressure) generation control
■Broadcast cell control
■ABR (ER control, binary mode)
■Congestion notification control
■Shaping