Figure 8-22 Mxp_Mr_2.5G And Mxpp_Mr_2.5G Block Diagram; Automatic Laser Shutdown - Cisco ONS 15454 DWDM Reference Manual

Hide thumbs Also See for ONS 15454 DWDM:

Table of Contents

Transponder and Muxponder Cards

Physical Interface for ATM (UTOPIA) interface. A transceiver add/drop multiplexer (TADM) chip

supports framing. Finally, the output signal is serialized and connected to the trunk front end with a

direct modulation laser. The trunk receive signal is converted into an electrical signal with an avalanche

photodiode (APD), is deserialized, and is then sent to the TADM framer and FPGA.

The MXPP_MR_2.5G is the same, except a 50/50 splitter divides the power at the trunk interface. In the

receive direction, there are two APDs, two SERDES blocks, and two TADM framers. This is necessary

to monitor both the working and protect paths. A switch selects one of the two paths to connect to the

client interface.

MXP_MR_2.5G and MXPP_MR_2.5G Block Diagram

You must use a 20-dB fiber attenuator (15 to 25 dB) when working with the MXP_MR_2.5G and

MXPP_MR_2.5G cards in a loopback configuration on the trunk port. Do not use direct fiber loopbacks

with the MXP_MR_2.5G and MXPP_MR_2.5G cards. Using direct fiber loopbacks causes irreparable

damage to the MXP_MR_2.5G and MXPP_MR_2.5G cards.

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 MXP_MR_2.5G and MXPP_MR_2.5G cards, refer to the

Cisco ONS 15454 DWDM Procedure Guide.

Deserializer

Cisco ONS 15454 DWDM Reference Manual, R8.5

8.9.8 Automatic Laser Shutdown

Chapters

Table of Contents