PM5364 pmc-sierra, PM5364 Datasheet - Page 167

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

13.5
13.5.1
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
The system side, when configured for 777 MHz TelecomBus mode, can be configured to
transmit J0 characters every frame or every four frames. The characters are output every frame
when SYSTEM_FRAME_MODE is ‘1’ and every four frames when
SYSTEM_FRAME_MODE is ‘0’. EJ0 is always expected every four frames or multiple
thereof.
Controlling the STSI Blocks
These blocks perform full STS-1 level switching (time stage) across a full OC-48
(STS-12/STM-4 serial stream at 77.76 MHz) and lie in both the egress and ingress paths. The
desired rearrangement of STS-1s is selected by setting the control pages entries (one per output
data stream and timeslot) to the desired input data stream and timeslot.
The timeslot interchange function is implemented with two control pages so that one can be
updated while the other is actively used for switching data. The transition of control from one
page to the next is synchronized with the beginning of a SONET frame on the data stream to
prevent any data loss.
Along with timeslot interchange, the Ingress Working STSIs have a programmable per timeslot
output which is used to control working/protect muxes on the line ingress path.
Different Modes
The STSI can operate in any one of four different modes. The mode is set by the SW_MODE
register (001Ah) for each STSI. The options are as follows:
SW_MODE = “00”: Normal Mode (Dynamic Switching Mode)
This is normal switching mode where the configuration pages determine where each STS1 is
switched.
SW_MODE = “01”: Reserved
SW_MODE = “10”: OC12 - OC48
This mode, illustrated in Figure 31, defines a straight-through timeslot connection, mapping
four OC-12 data streams into a single OC-48 data stream. There is no timeslot interchange on
the component OC-12 data streams.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
167