adm6993 Infineon Technologies Corporation, adm6993 Datasheet - Page 27

• Manufacturer Part Number: adm6993
• Description: Adm6993/x Hdlc To Fast Ethernet Converter
• Manufacturer: Infineon Technologies Corporation

Table 15
Drop Scheme for each queue
Utilization
00
01
11
3.3.12
At normal application which Switch connect to NIC card is by one by one TP cable. If Switch connects other device
such as another Switch must by two way. First one is Cross Over TP cable. Second way is to use extra RJ45 which
crossover internal TX+- and RX+- signal. By second way customers can use one by one cable to connect two
Switch devices. All these efforts need extra cost and are not good solutions. ADM6993/X provides Auto MDIX
function which can adjust TX+- and RX+- at correct pin. Users can use one by one cable between ADM6993/X
and other device either switches or NICs.
3.4
3.4.1
The ADM6993/X Media Converter incorporates a Fault Propagation feature, which allows indirect sensing of a
Fiber Link Loss via the 10/100Base-TX UTP connection. Whenever the ADM6993/X Media Converter detects a
Link Loss condition on the Receive fiber (Fiber LNK OFF), it disables its UTP link pulse so that a Link Loss
condition will be sensed on the UTP port to which the ADM6993/X Media Converter is connected. This link loss
can then be sensed and reported by a Network Management agent in the remote UTP port's host equipment. This
feature will affect the ADM6993/X UTP LNK LED.
The ADM6993/X Media Converter also incorporates a Far End Fault feature, which allows the stations on both
ends of a pairs of fibers to be informed when there is a problem with one of the fibers. Without Far End Fault, it is
impossible for a fiber interface to detect a problem that affects only its Transmitting fiber.
When Far End Fault is supported and enabled, a loss of received signal (link) will cause the transmitter to generate
a Far End Fault pattern in order to inform the device at the far end of the fiber pair that a fault has occurred. Unless
Fiber Link Loss occurred, if the UTP port link failed, the ADM6993/X Media Converter will also generate a Far End
Fault pattern in order to inform the device at the far end of the fiber pair that a fault has occurred.
3.4.2
The ADM6993/X Media Converter incorporates a Redundant Link feature, which allows designing a cost-effective
Redundant TX FX Media Converter to provide a more reliable fiber link.
At converter mode (FXMODE[1:0]=10 and RDNT_EN=1), pin CAS_DIS of primary ADM6993/X connects to pin
CHIP_DIS of secondary ADM6993/X.
•
•
•
Data Sheet
While FX port works well, pin CAS_DIS will output “1” to disable 2
While FX fiber link loss or the remote fault detection happens, pin CAS_DIS will output “0” to enable 2
ADM6993/X.
While ADM6993/X disable, TX port will become Hi-Z state.
Discard Mode
Drop Scheme for each queue
Auto TP MDIX Function
Converter Functional Description
Fault Propagation
Redundant Link
00
0%
0%
0%
01
0%
0%
25%
27
10
0%
25%
50%
nd
ADM6993/X
Function Description
Rev 1.11, 2005-11-28
11
0%
50%
75%
ADM6993/X
nd