Preliminary
PM8610 SBS
SBI Bus Serializer / STS-12 Time Slot Interchange
FEATURES
• Monolithic integrated circuit that
implements conversion between byte-
serial 19.44Mhz SBI bus or 77.76MHz
SBI336 bus and redundant 777.6Mbps
bit-serial 8B/10B-base SBI336S bus.
• SBI converter and TDM time slot
interchange.
• Quad byte wide 19.44MHz SBI bus to
777.6MHz serial SBI336S converter.
• Byte wide 77.76MHz SBI336 bus to
777.6MHz serial SBI336S converter.
• Quad byte wide 19.44MHz
TelecomBus to serial 777.6MHz
TelecomBus converter.
• Byte wide 77.76MHz TelecomBus to
serial 777.6MHz TelecomBus
converter.
• Quad byte wide 19.44 MHz SBI bus to
byte wide 77.76 MHz SBI bus bridge.
• Quad byte wide 19.44 MHz
TelecomBus to byte wide 77.76 MHz
TelecomBus bridge.
• DS0, NxDS0, T1, E1, VT1.5, VT2, DS3
and E3 granular quad SBI to serial
SBI336S time slot interchange.
• DS0, NxDS0, T1, E1, VT1.5, VT2, DS3
and E3 granular SBI336 to serial
SBI336S time slot interchange.
• VT1.5, VT2, STS-1 quad 19.44MHz
TelecomBus to serial TelecomBus
switch. Requires J1 byte alignment.
• VT1.5, VT2, STS-1 77.76MHz
TelecomBus to serial TelecomBus
switch. Requires J1 byte alignment.
• With the Narrowband Switch Element,
PM8620 NSE-20G, the SBS can be
used to implement a switch fabric
scaleable to 20Gb/s.
• With the Narrowband Switch Element,
PM8621 NSE-8G, the SBS can be
used to implement a switch fabric
scaleable to 8Gb/s.
• Integrates two independent DS0
granularity Time Slot Interchange
Switches (full duplex).
• Nominal latency through the SBS in
DS0 mode is 125µS. Channel
Associated Signaling (CAS) latency
through the SBS in DS0 mode is two
T1 multiframes (6 ms) or two E1
multiframes (4 ms).
• In TelecomBus mode or SBI mode
without DS0 level switching nominal
latency through the SBS is <16µS.
• The Time Slot Interchange Switch
permits any receive or incoming byte
from an input tributary to be mapped to
any outgoing or transmit byte,
respectively, on the associated output
tributary.
• Supports working and protect serial
SBI336 or TelecomBus links to support
a redundant switch fabric architecture.
• Encodes and decodes byte wide SBI
bus and 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 SBI
bus or TelecomBus stream to working
and protect 777.6Mbps LVDS serial
links with 8B/10B-based encoding.
• Decodes data from working and
protect 777.6MHz LVDS serial links
with 8B/10B-based encoding to the
Outgoing SBI bus or TelecomBus
stream.
• In SBI mode, switches Channel
Associated Signaling bits, CAS, with all
DS0 data.
• Uses 8B/10B-based line coding
protocol on the serial links to provide
transition density guarantee and DC
balance and to offer a greater control
character vocabulary than the
standard 8B/10B protocol.
• Provides optional PRBS generation for
each LVDS serial data link for off-line
link verification. PRBS can be
processed with minimum STS-1
granularity.
• Provides hardware and software
control to coordinate the connection
mapping of the local device, peer SBS
devices and companion NSE switch
devices.
BLOCK DIAGRAM
Telecom/SBI Bus
Input User
Message
Telecom/SBI Bus
Connect Memory
Control
Incoming Memory
Switch Unit and
CAS Processing
1/2 WORKING
PRBS processing and In-
Band Link Controller
1/2 PROTECT
PRBS processing and In-
Band Link Controller
TRANSMIT WORKING
Encoder/Serializer and
LVDS Interface
TRANSMIT PROTECT
Encoder/Serializer and
LVDS Interface
Transmit
Working
LVDS
Transmit
Protect
LVDS
1/2 WORKING
Outgoing Memory
Switch Unit and
CAS Processing
PRBS processing and In-
Band Link Controller
1/2 PROTECT
PRBS processing and In-
Band Link Controller
RECEIVE WORKING
Decoder, Data recovery
and LVDS Interface
RECEIVE PROTECT
Decoder, Data recovery
and LVDS Interface
Receive
Protect
LVDS
Telecom/SBI Bus
Receive
Working
LVDS
Telecom/SBI Bus
Connect Memory
Control
Output User
Message
Microprocessor
Interface
JTAG
PMC-2000169 (P4)
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
© Copyright PMC-Sierra, Inc. 2001
PMC [ PMC-SIERRA, INC ]
