PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
5
APPLICATION EXAMPLES
The PM5356 S/UNI-622-MAX is applicable to equipment implementing Asynchronous Transfer
Mode (ATM) User-Network Interfaces (UNI), ATM Network-Network Interfaces (NNI).
The S/UNI-622-MAX may find application at either end of switch-to-switch links or switch-to-
terminal links, both in public network (WAN) and private network (LAN) situations. The S/UNI-
622-MAX provides a comprehensive feature set as well as full compliance to WAN
synchronization requirements. The S/UNI-622-MAX performs the mapping of ATM cells into the
SONET/SDH STS-12c/STM-4-4c synchronous payload envelope (SPE) and processes
applicable SONET/SDH section, line and path overheads.
In a typical STS-12c/STM-4-4c ATM application, the S/UNI-622-MAX performs clock and data
recovery in the receive direction and clock synthesis in the transmit direction of the line interface.
The S/UNI-622-MAX can also be configured to by-pass the clock recovery, clock synthesis, and
serializer/de-serializer functions. In this mode, an external clock and data recovery/serial-to-
parallel converter device is required in the receive direction, and an external serial-to-parallel
converter/clock synthesis device is required in the transmit direction.
On the system side, the S/UNI-622-MAX interfaces directly with ATM layer processors and
switching or adaptation functions using a UTOPIA Level 2 compliant 16-bit (clocked up to 50
MHz) or an UTOPIA Level 3 8-bit (clocked up to 100 MHz) synchronous FIFO style interface.
An application with a UTOPIA Level 2 system side interface is shown in Figure 1. An application
with a UTOPIA Level 3 system side is shown in Figure 2. The initial configuration and ongoing
control and monitoring of the S/UNI-622-MAX are normally provided via a generic microprocessor
interface.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
9
PMC [ PMC-SIERRA, INC ]
