PM5345 S/UNI-155
DATA SHEET
PMC-930305
ISSUE 4
SATURN USER NETWORK INTERFACE
4
APPLICATION INFORMATION
The S/UNI is typically used to implement the core of an ATM User Network
Interface by which an ATM terminal is linked to an ATM switching system or ATM
switching systems are linked together using SONET/SDH compatible transport.
The S/UNI may find application at either end of terminal to switch links or switch
to switch links, both in private network (LAN) and public network (WAN)
situations.
In this application the S/UNI typically connects on its line side with a twisted pair
line receiver or optical receiver, plus a clock and data recovery device and a
twisted pair line driver or laser for the transmitter. In this application, the S/UNI is
loop timed internally (the recovered 155.52 MHz clock is used in the transmit
direction). The drop side interfaces directly with ATM adaptation layer
processors. The initial configuration and ongoing control and monitoring of the
S/UNI are normally provided via a generic microprocessor interface. The S/UNI
supports a "hardware-only" operating mode where an external microprocessor is
not required. Typical ATM Adapter card applications are shown in Figure 1 and
Figure 2.
Figure 1
- Example 1. Optical ATM Adapter Interface
TDAT[15:0]
Transmit
AAL
Processor
TSOC
TWRB
TCA
Optical
Transmitter
PM5345
S/UNI
SATURN
ATM Terminal
USER NETWORK
INTERFACE
RCA
Optical
Receiver
Clock
Recovery
Receive
AAL
Processor
RDAT[7:0]
RSOC
RRDB
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
6
PMC [ PMC-SIERRA, INC ]
