16-98
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
April 2006
Chapter 16 Card Reference
16.8.4 MXP_2.5G_10G Card
Figure 16-63
MXP_2.5G_10G Card Block Diagram
16.8.4.1 Y-Cable Protection
For the MXP_2.5G_10G card, protection is done using Y-cable protection. In Y-cable protection, the
client ports of two MXP_2.5G_10G cards can be joined by Y cables in a Y-cable protection group. A
single Rx client signal is injected into the Rx Y-cable and is split between the two MXP_2.5G_10G cards
in the protection group. The Tx client signals from the two protection group MXP_2.5G_10G cards are
connected via the TX Y cable with only the active card signal passing through as the single TX client
signal. See the
“16.9.1 Y-Cable Protection” section on page 16-114
Note
If you create a GCC on either card of the protect group, the trunk port stays permanently active,
regardless of the switch state. When you provision a GCC, you are provisioning unprotected overhead
bytes. The GCC is not protected by the protect group.
16.8.4.2 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 ALS
provisioning information, see the
“DLP-G223 Change Line Settings for MXP_2.5G_10G and
MXP_2.5G_10E Cards” section on page 5-34
.
16.8.4.3 Timing Synchronization
The MXP_2.5G_10G card is synchronized to the TCC2/TCC2P clock during normal conditions and
transmits the ITU-T G.709 frame using this clock. The TCC2/TCC2P card can operate from an external
BITS clock, an internal Stratum 3 clock, or from clock recovered from one of the four valid client clocks.
If clocks from both TCC2/TCC2P cards are not available, the MXP_2.5G_10G card switches
automatically (with errors, not hitless) to an internal 19.44 MHz clock that does not meet SONET clock
requirements. This will result in a clock alarm.
uP bus
uP
Flash
RAM
ASIC
Optical
Transceiver
STM-64 / OC-192
9.953,
10.3125,
10.709, or
11.095 Gbps
SCI
83659
B
a
c
k
p
l
a
n
e
Optical
Transceiver
STM-64 / OC-192
9.95328 or
10.70923 Gbps
Framer/FEC/DWDM
Processor
DWDM (Trunk)
Client
Summary of Contents for ONS 15454 DWDM
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