TXC-06312BIOG Transwitch Corporation, TXC-06312BIOG Datasheet - Page 107

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

Specifications of TXC-06312BIOG

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PHAST-12N Device
DATA SHEET
- Operation -
TXC-06312B
10.11.6 Example: STM-1 Mode, 1+1 APS Protection
Figure 32
shows an example of a 1+1 APS protection architecture in STM-1/OC-3 mode using
two PHAST-12N devices. One PHAST-12N device handles up to four Worker lines (W) while
a second PHAST-12N handles the associated Protection lines (P). Both devices are
interconnected through the APS Port interface, using one fourth of the bandwidth per STM-1/
OC-3 protection group. The cross connects of both devices setup permanent bridges from the
Worker Transmit lines to their Protection Transmit lines over one of the APS Port interfaces.
The received protection payload of the four lines is available on the other APS Port interface.
W1
W2
W3
W4
P1
P2
P3
P4
PHAST-12N #1
PHAST-12N #2
RxApsPort
TxApsPort
y
y
y
y
Cross
Cross
Connect
Connect
device #1
device #2
RxApsPort
TxApsPort
W1
W2
W3
W4
Protected Traffic
To/From POH Monitor/Generator
Figure 32. STM-1/OC-3, 1+1 APS Idle State
When the APS FSM detects a failure of one of the Worker lines, e.g., line #2 in
Figure
33, the
cross connect of the Worker PHAST-12N performs the protection switch. It connects the
receive protected traffic of the failed line to the payload of its associated received Protection
line available at the Receive APS Port interface.
1 0 7 o f 2 02
PRELIMINARY TXC-06312B-MB, Ed. 2
June 2005