NEC UPD98413 User Manual page 87

(4) 1+1 APS support
The µ PD98413 Support 1+1 APS architecture, which can transmit the same cell or packet for working port and
protection port, and can switch the receive port from working port to protection port.
(a) Transmit
The µ PD98413 can transmit the same cell or packet for working port and protection port. The method is as
follows.
1. Set the same transmit port address to the UADR bit of working Port and protection port of the PTADRT
register. (In the POS mode, set the same in-band address to the IADR bit of working port and protection port
of the PTADRT register. )
2. Transmit cell/packet for port, which is set by UADR bit the PTADRT register.
Note: Take care of the transmit cell available signal. When transmit cell/packet to the port, the uplink device must be
conform the cell available signal of each port that is transmitted the same cell/packet. (In the status polling
mode, the result of polling is ORed working port and protection port which is set the same port address.)
(Port3)
Port3
Transmit
FIFO
CHAPTER 3 FUNCTIONAL OUTLINE
same port address
(setting by the UADR bit of the PTADRT register)
protection
(Port2)
Port2
Transmit
FIFO
same cell/packet
UTOPIA/POS-PHY
Interface
PRELIMINARY
working port
port
(Port 0)
(Port1)
Port1 Port0
Transmit Transmit
FIFO FIFO
NEC confidential and Proprietary
87