Cisco Cisco DWDM Transceiver Modules 集約されたデータ
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Note:
1. In some cases, customers might experience that a link would be operating properly over FDDI-grade, OM1 or
OM2 fiber types without MCP. However please note there is no guarantee link will be operating properly over
time, and the recommendation remains to use the MCP.
2. There is a risk associated to this type of nonstandard deployment without MCP, especially when the jumper
cable is an FDDI-grade or OM1 type. In such case the power coupled directly into a 62.5-micron fiber could
be as high as a few dBm and the adjacent receiver will be saturated. This can cause high bit error rate, link
flaps, link down status and eventually irreversible damaged to the device.
3. In the event customers remain reluctant to deploy MCP cables, and for customers using OM3 cables, please
measure the power level before plugging the fiber into the adjacent receiver. When the received power is
measured above -3dBm, a 5-dB attenuator for 1300nm should be used and plugged at the transmitter source
of the optical module on each side of the link.
4. Another alternative for short reaches within the same location is to use a single-mode patch cable. There will
be no saturation over single-mode fiber.
Requirements for 10 Gigabit Ethernet Transmissions
The requirement for MCP is specified only for 10GBASE-LX4 and 10GBASE-LRM transceivers transmitting in the
1300-nm window and in applications over MMF. MCP should never be used in 10GBASE-SR links in the 850-nm
window.
MCP is required for 10GBASE-LX4 and 10GBASE-LRM applications over FDDI-grade, OM1, and OM2 fiber types.
MCP should never be used for applications over OM3, also known as “laser-optimized fiber.”
Notes for LX4:
1. In some cases, customers might experience that a link would be operating properly over OM2 fiber type
without MCP. However chances of experiencing a properly operating link over FDDI-grade or OM1 fiber types
without MCP are very low.
2. In the event customers remain reluctant to deploy MCP cables over OM2, and for customers using OM3
cables, it is required to a plug a 5-dB attenuator for 1300nm at the transmitter source of the optical module on
each side of the link in order to avoid saturation, and potential subsequent link flaps and damage to the
device.
3. Another alternative for short reaches within the same location is to use a single-mode patch cable. There will
be no saturation over single-mode fiber. Please note the 10GBASE-LX4 devices can reach up to 10km over
single-mode fiber as per compliance to IEEE.
Notes for LRM:
1. For customers using OM3 fiber type, MCP should not be used. It is highly recommended to measure the
power level before plugging the fiber into the adjacent receiver. When the received power is measured to be
above 0.5dBm, a 5-dB attenuator for 1300nm should be used and plugged at the transmitter source of the
optical module on each side of the link.
2. Another alternative for short reaches within the same location is to use a single-mode patch cable. There will
be no saturation over single-mode fiber. Please note the 10GBASE-LRM devices can reach up to 300m over
single-mode fiber as per Cisco specifications.