DS-64NC Synchronous Data Module
Appendix A –Module Adapters for the DS-64NC Module
Version 9.1
A-10
GatesAir
Intraplex Products
●
256-frame buffer
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10,000 MAC address LAN table
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Automatic learning and aging of MAC addresses
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Switch-selectable enhanced compression
Enhanced Tinygram 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 repadded while
being received on the other side.
Over time the MA-427 module adapter automatically learns and stores a table with up to 10,000 MAC
addresses of devices on the WAN. When the filter is on, the MA-427 adapter uses 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.
A.3.1
Installation and Operation
To install the MA-427 module adapter (MA) into an Intraplex multiplexer, perform these steps:
1.
Verify the MA’s switches are set to the defaults in Table A-3. Figure A-10 shows the switches on
the board.
Table A-3. MA-427 Switch Settings
Switch
Default
Settings
Switch Options
#
Name
8
COMPR*
(Compression)
Down
Down = Compression off
Up = Compression on
7
FILTER*
Down
Down = Filter and forward (bridge) off
Up = Filter and forward (bridge) on
6
WMODE
(WAN)
Down**
Down = Synchronous
Up = Asynchronous – Do not use; asynchronous operation not supported.
5
MODE 4
Down
Down = Default setting for 10Mb half-duplex
Up = Combined with Mode 0 in the Up position creates setting for 10MB full-duplex
4
MODE 3
Down
†
3
MODE 2
Down
†
2
MODE 1
Down
†
1
MODE 0
Up
†
Down = Not applicable
Up = Indicates 10Mb when it is the only mode set to the Up position. When
combined with Mode 4 in the Up position, indicates 10Mb full-duplex
* The compression and filter switch must each have the same setting as their corresponding switch
on the far side of the network.
** To ensure proper operation with the DS-64NC module, do not change the WMODE switch from its
default setting.
†
Unless you need to change from half- to full-duplex, do not change MODE 0-4 switches from their
default settings.
Содержание Intraplex DS-64NC
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