8-49
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 8 Transponder and Muxponder Cards
8.9.8 Automatic Laser Shutdown
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.
Figure 8-22 MXP_MR_2.5G and MXPP_MR_2.5G Block Diagram
Caution 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.
8.9.8 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 MXP_MR_2.5G and MXPP_MR_2.5G cards, refer to the
Cisco ONS 15454 DWDM Procedure Guide.
SFP 1
SFP 6
SFP 5
SFP 4
SFP 3
SFP 2
SFP 8
SERDES
FPGA
(for
FC,
GE,
FICON,
ESCON,
PCS,
B2B,
GFP-T)
SERDES
SFP 7
High-speed
SERDES
QDR
SRAM
TADM
framer
Laser
APD
Serializer
Deserializer
ESCON
ESCON
ESCON
ESCON
ESCON
ESCON
Trunk
interface
134986
GE, FC,
FICON,
ESCON
GE, FC,
FICON,
ESCON
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