Figure 8-15 Txp_Mr_2.5G And Txpp_Mr_2.5G Block Diagram; Automatic Laser Shutdown - Cisco ONS 15454 DWDM Reference Manual

Chapter 8 Transponder and Muxponder Cards
Figure 8-15 TXP_MR_2.5G and TXPP_MR_2.5G Block Diagram
Switch
SFP Client
CPU to
CPU
GCC
FPGA
CELL
BUS
FPGA
SCL BUS
CELL BUS
You must use a 20-dB fiber attenuator (15 to 25 dB) when working with the TXP_MR_2.5G and
Caution
TXPP_MR_2.5G cards in a loopback on the trunk port. Do not use direct fiber loopbacks with the
TXP_MR_2.5G and TXPP_MR_2.5G cards. Using direct fiber loopbacks causes irreparable damage to
the TXP_MR_2.5G and TXPP_MR_2.5G cards.
You can install TXP_MR_2.5G and TXPP_MR_2.5G cards in Slots 1 to 6 and 12 to 17. You can
provision this card in a linear configuration. TXP_MR_10G and TXPP_MR_2.5G cards cannot be
provisioned as a BLSR/MS-SPRing, a path protection/SNCP, or a regenerator. They can be used in the
middle of BLSR/MS-SPRing or 1+1 spans only when the card is configured for transparent termination
mode.
The TXP_MR_2.5G card features a 1550-nm laser for the trunk/line port and a 1310-nm laser for the
client port. It contains two transmit and receive connector pairs (labeled) on the card faceplate. The card
uses dual LC connectors for optical cable termination.
The TXPP_MR_2.5G card features a 1550-nm laser for the trunk/line port and a 1310-nm or 850-nm
laser (depending on the SFP) for the client port and contains three transmit and receive connector pairs
(labeled) on the card faceplate. The card uses dual LC connectors for optical cable termination.

8.6.3 Automatic Laser Shutdown

The ALS procedure is supported on both client and trunk interfaces. On the client interface, ALS is
compliant with ITU-T G.664 (6/99). On the data application and trunk interface, the switch on and off
pulse duration is greater than 60 seconds. The on and off pulse duration is user-configurable. For details
regarding ALS provisioning for the TXP_MR_2.5G and TXPP_MR_2.5G cards, refer to the
Cisco ONS 15454 DWDM Procedure Guide.
78-18343-02
2R Tx path
2R Rx path
Mux
Main
Demux
ASIC
CPU
I/F
Protect
ASIC
DCC
SCL
Switch Driver
Mux
Demux
Switch Cross
Switch
Mux
Demux
Cisco ONS 15454 DWDM Reference Manual, R8.5
8.6.3 Automatic Laser Shutdown
Trunk
Tunable
Out
Laser
Limiting Main
Amp APD+TA
Limiting Protect
Amp APD+TA
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