CTC Union FRM220-NMC, User Manual, Page: 162 / 182

Appendix A
160
A.7.24 OAM Configuration
Ethernet in the First Mile ( EFM ) is the nickname of IEEE Std 802.3ah-2004, an amendment to the Ethernet
standard, specifying "Media Access Control Parameters, Physical Layers, and Management Parameters for
Subscriber Access Networks". The EFM standard was approved by the IEEE Standards Board in June 2004, and
officially published on September 7, 2004. In 2005 it was included into the base IEEE 802.3 standard.
The "Last Mile" is the name traditionally given to the part of a public communication network that links the last
provider-owned node (the central office, the street cabinet or pole) with the customer premises equipment (CPE).
The "First Mile" is the exact same thing, viewed from the customer's perspective.
IEEE 802.3ah OAM (Operations, Administration, Maintenance) specification covers the OAM frames used
across a physical IEEE 802.3 medium between a Provider and a Customer, or perhaps between two Provider ports
or two Customer ports. In the
10/100A product, OAM refers to the frames sent between units over fiber links. OAM
is NOT forwarded over links.
Ethernet OAM is complementary, not competitive, with SNMP (Simple Network Management Protocol)
management in that it provides some basic management functions at layer two, rather than using layer three and
above as required by SNMP over an IP infrastructure. Ethernet OAM provides single-hop functionality in that it
works only between two directly connected Ethernet stations. SNMP can be used to manage the Ethernet OAM
interactions of one Ethernet station with another.
A.7.24.1 OAM PDU frame size
OAM PDU frames must be within the legal Ethernet frame size range of 64 to 1518 bytes. OAM frames MUST
be untagged. The maximum transmit rate of OAM PDU frames is 10 per second. In an OAM pair, only the 'Active'
unit needs to set the frame size. The 'Passive' OAM unit will negotiate and follow the 'Active' unit during
OAM
Discovery . The default and recommended OAM PDU size is 1500 bytes. The active and passive units must have
the same OAM frame size.
To configure, from the main menu, select <L> (Local Status and Configuration), then select <D> (Device Status
and Configuration). From this menu select <3> (Maximum OAMPDUs Size) and set as follows.
*************************************************
*** CTC UNION TECHNOLOGIES CO., LTD. ***
*** FRM220-10/100AS-2 ver:3.016 ***
*************************************************
<< Local Device Status and Configuration >>
<1> :Pause Frame [Disable]
<2> :Advance Functions [Normal ]
<3> :Maximum OAMPDUs Size (60 ~ 1518 Octets) [1500]
<4> :Accept Remote H/W Reset [Disable]
<5> :UPNP [Disable]
<A> :Remote A H/W Reset.
<B> :Remote B H/W Reset.
<L> :Load Default Settings and Write to System.
<R> :System Reboot.
<ESC>:Go to Previous Menu.
______________________________________________________________
Set MAX OAMPDUs Size(Allowed Range: 60 ~ 1518 Bytes).
<ESC>:Discard and Return.
Please Input Size:[1500]