SBSLITE™ Telecom Standard Product Data Sheet
Preliminary
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Features
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The PM8611 SBI336 Bus Serializer (SBSLITE™) is a:
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Scalable Bandwidth Interconnect (SBI™) converter and Time Division Multiplexer
(TDM) SBI switch.
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Byte-wide 77.76 MHz SBI336 bus to 777.6 MHz serial SBI336S converter.
DS0, NxDS0, T1, E1, TVT1.5, TVT2, DS3 and E3 granular SBI336 to serial SBI336S
switch. Supports subrate link switching with the restriction that subrate links must be
symmetric in both the transmit and receive directions.
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Byte-wide 77.76 MHz TelecomBus to serial 777.6 MHz TelecomBus converter. This
requires the TelecomBus J1 byte to be in a fixed location corresponding to a value of 0 or
522 which is immediately following the C1 octets:
VT1.5, VT2, STS-1 77.76 MHz TelecomBus to serial TelecomBus switch.
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Can be used with the Narrowband Switch Elements, NSE-20G, to implement a DS0
granularity SBI Memory:Space:Memory switch scalable to 20 Gbit/s and NSE-8G, to
implement a switch scalable to 8 Gbit/s. In TelecomBus mode, a 20 Gbit/s VT1.5/VT2
granularity Memory:Space:Memory switch can be implemented.
Integrates two independent DS0 granularity Memory Switches. One switch is placed
between the incoming 77.76 MHz byte-wide SBI336 bus and the transmit working and
protect Serial SBI336S link. The transmit working and protect links transmit the same data.
The other switch is placed between the receive working or protect Serial SBI336S link and
the outgoing 77.76 MHz byte-wide SBI336 bus.
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Provides 125 µS nominal latency in DS0 mode. Channel Associated Signaling (CAS) latency
through the SBSLITE in DS0 mode is two T1 multiframe (6 mS) or two E1 multiframe (4
mS).
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Provides less than 16 µS nominal latency in TelecomBus mode or SBI mode without DS0
level switching.
Permits any receive or incoming byte from an input port to be mapped to any outgoing or
transmit byte, respectively, on the associated output port through the Memory switch.
Supports redundant working and protect serial SBI336S links in support of a redundant
Memory:Space:Memory switch with the NSE.
Encodes and decodes byte-wide SBI336 bus control signals for all SBI supported link types
and clock modes for transport over the serial SBI336S interface.
Encodes data from the Incoming SBI336 bus or TelecomBus stream to a working and protect
777.6 Mbit/s LVDS serial links with 8B/10B-based encoding.
Decodes data from a working and protect 777.6 MHz low voltage differential serializer
(LVDS) serial links with 8B/10B-based encoding to the Outgoing SBI336 bus or TelecomBus
stream.
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In SBI mode, switches CAS bits with all DS0 data.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
9
PMC [ PMC-SIERRA, INC ]
