參數(shù)資料
型號(hào)： TMC2005
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 網(wǎng)絡(luò)接口
英文描述： 5 Port HUB Controller Device
中文描述： DATACOM, NETWORK INTERFACE SUPPORT CIRCUIT, PQFP60
封裝： QFP-60
文件頁(yè)數(shù)： 27/32頁(yè)
文件大小： 153K
代理商： TMC2005
SMSC DS – TMC2005
Page 27
Rev. 10/24/2000
Ring Network With the TMC2005
The reliability of the network can be improved by connecting every node in a ring, because the communication is
maintained through the reverse route even if the cable is cut at a point. However ARCNET controller alone can not
support ring, because ARCNET is a half-duplex communication system. Using HUBs makes possible for
ARCNET to built a ring network as in Fig.16. This configuration is available only for using fiber optics.
FIGURE 16 - RING CONFIGURATION
Note 1:
Noise may cause an endless loop in a ring system, and the network may hang up. Therefore take care of
designing the patterns between TMC2005 and transceiver or cabling of system.
Example for system hang-up
-
A noise occurs only at “A” point in Figure 16.
-
The noise propagates clockwise on the network.
-
TMC2005 detects the noise that came back through the ring.
-
The noise causes an endless loop in the ring.
Example for no hang-up
-
-
-
Any noise occurs at “A” and “B” points in Figure 16 at the same time.
The noise propagates to both directions in the network.
An endless loop doesn’t occur because TMC2005s in the middle absorb the noise from both sides.
Note 2:
Place a watch dog timer on one of the TMC2005 in at least one ring. To protect from hang-up the detecting
time of the watch dog timer should be set to longer than 2.7 mS (@ 2.5Mbps) that is the burst time in the
ARCNET protocol.
Note 3:
Consider that a total of each segment delay time (cable delay, TMC2005 delay, driver delay and receiver
delay) between HUBs in a network is less than 5.6uS (@ 2.5Mbps). The maxmimum distance between
HUBs is approximiately 1000m (@ 2.5Mbps).
TMC2005
COM20020
nRESET
CK
CT
TMC2005
COM20020
TMC2005
COM20020
TMC2005
COM20020
Optical Fiber
A
B
Optical Transceiver
TXEN of any port
TXEN
nRST
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