Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Filtering
Over time the MA-427 LAN Bridge will automatically learn and store a table with up to 10,000 MAC
addresses of devices on the WAN. When the filter is on, the MA-427 LAN Bridge will use the MAC
address table to only allow frames destined for another LAN over the WAN. When the filter is off, all
frames are sent over the WAN. RFL recommends that this setting be left in the default (UP) position
for optimum operation of the DS-562NC.
Compression
Compression increases data throughput. Valid Ethernet frames have a minimum length of 64 bytes.
Shorter frames are padded. With compression enabled (by asserting the COMPR signal), these
padding bytes are stripped off before transmission over the WAN, and re-padded while being received
at the other end. RFL recommends that this setting be left in the default (DOWN) position for
optimum operation of the DS-562NC.
Connecting the MA-427 LAN Bridge to Your LAN
You should connect the MA-427 LAN Bridge to a hub or Ethernet switch using a straight-through
cable such as a Black Box 10 ft. straight-through cable (P/N EVSA85-0010).
If you connect the MA-427 directly to a PC or a network interface card (NIC), the RJ-45 cable must
implement a UTP crossover function, such as Black Box 10 ft. crossover cable (P/N EVCRA85-0010).
Table 17 provides information for straight-through and crossover cable pin connections. Figure 13
shows the locations of pins 1 and 8 on the RJ-45 connector and on the MA-427.
Table 17. Straight-Through and Crossover RJ-45 UTP Cable Pin Connections
Straight-Through RJ-45 UTP
Cable Pin Connections
Crossover RJ-45 UTP
Cable Pin Connections
MA-427
HUB or
Ethernet switch
MA-427 PC or NIC
Pin Function Pin Function Pin Function Pin Function
1 TX+ 1 TX+ 1 TX+ 1 RX+
2 TX- 2 TX- 2 TX- 2 RX-
3 RX+ 3 RX+ 3 RX+ 3 TX+
4 Not Used 4 Not Used 4 Not Used 4 Not Used
5 Not Used 5 Not Used 5 Not Used 5 Not Used
6 RX- 6 RX- 6 RX- 6 TX-
7 Not Used 7 Not Used 7 Not Used 7 Not Used
8 Not Used 8 Not Used 8 Not Used 8 Not Used
8
1
8
1
LINK LED
LAN TX/RX
LED
RJ-45 Connector
MA-427
Figure 13. Pins 1 and 8 on RJ-45 connector and on MA-427 LAN Bridge
RFL DS-562NC RFL Electronics Inc.
July 5, 2012 29 (973)
334-3100
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