TXC-06312BIOG Transwitch Corporation, TXC-06312BIOG Datasheet - Page 105

• Manufacturer Part Number: TXC-06312BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06312BIOG

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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10.11.4 Example: STM-4/OC-12 Mode, 1+1 APS Protection
The functionality of the APS Interfaces described in
of the AU Pointer Tracker and the STM-4 like APS frame makes the APS port can be used as
a STM-4 SONET Lite Port. Important limitation to know about this: the incoming B2 bytes are
NOT processed by the APS Monitor. Remark also the APS port has LVDS I/Os while the Line
Ports has LVPECL I/Os.
Figure 30
One PHAST-12N device handles the Worker line (W) while a second PHAST-12N handles
the Protection line (P). Both devices are interconnected through the full bandwidth of APS
Port interface. The cross connects of both devices setup a permanent bridge from the Worker
Transmit line to the Protection Transmit line over one of the APS Port interfaces. The
received protection payload is available on the other APS Port interface.
When the APS FSM detects a failure of the Worker line the cross connect of the Worker
PHAST-12N performs the protection switch. It connects the receive protected traffic to the
Receive APS Port interface which transports the payload of the received Protection line.
Protected Traffic
W
W
shows an example of a 1+1 APS protection architecture in STM-4/OC-12 mode.
y
TxApsPort
RxApsPort
Figure 30. STM-4/OC-12, 1+1 APS
RxApsPort
TxApsPort
- Operation -
P
Protected Traffic
Switch
W
W
“APS Interface” on page
y
TxApsPort
RxApsPort
PRELIMINARY TXC-06312B-MB, Ed. 2
PHAST-12N Device
TxApsPort
RxApsPort
96, the presence
P
DATA SHEET
TXC-06312B
June 2005