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
