CTC Union ET100A Bedienungsanleitung PDF herunterladen (Seite 14)

ET100/G64 LAN-WAN Bridge

Filter:

When this feature is disabled, all frames are passed transparently. In this configuration, the

ET100/G64 acts as a repeater. When the filter is enabled, frame destinations are tested against the internal

MAC address table. Filtering enabled is the normal selection for Bridging but is usually disabled when

connecting to a switching HUB.

Auto-negotiation:

When this feature is enabled (SW4-6=OFF), the Duplex (SW4-5) and Speed (SW4-4) settings are

ignored and are automatically determined from the LAN connection. When this feature is disabled, the

Duplex and Speed settings of the LAN follow the settings of SW4-4 and SW4-5 and auto MDIX will be

disabled.

Packet Buffer Utilization:

The ET100/G64 contains a 340 packet buffering capacity. When SW4-1 is OFF and SW4-2 is ON,

this buffer is divided equally between LAN to WAN and WAN to LAN packet traffic. When the LAN is

Fast Ethernet and the WAN connection is slow, the buffer may be better utilized by applying a greater

portion to the LAN to WAN packet traffic. In this case, set both SW4-1&2 to OFF. This will provide a 9 to

1 buffer division for LAN to WAN versus WAN to LAN buffer and should increase utilization.

1.7 Clocking Examples

In the following example, the ET100/G64 is configured for bridging over synchronous G.703 64K

Co-directional data signals. One ET100/G64 is configured with an internal clock to facilitate

point-to-point application with another ET100/G64. The internal clock is fixed at 64Kbps. The unit

configured for external clock receives timing from the unit providing the co-directional clock.

TD+

TD-

RD+

RD-

RD+

RD-

TD+

TD-

Internal CO Receive

Figure 6: Point to Point, Master (internal) and Slave (receive clock)

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CTC Union ET100A Bedienungsanleitung Seite 14