PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
5
APPLICATION EXAMPLES
The PM5381 S/UNI-2488 is applicable to equipment implementing Asynchronous Transfer Mode
(ATM) User-Network Interfaces (UNI), ATM Network-Network Interfaces (NNI), as well as Packet
over SONET (POS) interfaces. The POS interface can support several packet based protocols,
including the Point-to-Point Protocol (PPP). The S/UNI-2488 may find application at either end of
switch-to-switch links, router to router links, switch to router links or switch-to-terminal links, in
public and privite wide area networks (WAN). The S/UNI-2488 provides a comprehensive feature
set as well as full compliance to WAN synchronization requirements. The S/UNI-2488 performs
the mapping of either ATM cells or POS frames into the SONET/SDH STS-48 (STM-16-16c)
synchronous payload envelope (SPE) and processes applicable SONET/SDH section, line and
path overheads.
In a typical STS-48 (STM-16-16c) ATM application, the S/UNI-2488 performs clock and data
recovery in the receive direction and clock synthesis in the transmit direction of the line interface.
On the system side, the S/UNI-2488 interfaces directly with ATM layer processors and switching
or adaptation functions using a UTOPIA Level 3 compliant 32-bit (clocked up to 104 MHz)
synchronous FIFO style interface. An application with a UTOPIA Level 3 system side interface is
shown in Figure 1. The initial configuration and ongoing control and monitoring of the S/UNI-
2488 are normally provided via a generic microprocessor interface.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
10
PMC [ PMC-SIERRA, INC ]
