WC-SERIAL USER MANUAL
76-02-103 Rev.C
Page 13 of 17
2.2.1 Switch 1, Data Inversion
In normal operation the WC-Serial would be operated with the data in normal mode
with a ‘1’ representing a Mark, and ‘0’ representing Space. This switch allows this to
be inverted.
2.2.2 Switch 2, TX Clock Inversion
In normal operation the WC-Serial would be operated with the transmit clock in the
normal state. In contra-directional systems, such as X.21 if long cables are used it
may be desirable to invert the TX clock to overcome errors induced by the round trip
transit delay of the cable.
2.2.3 Switch 3, RX Clock Inversion
In normal operation this switch should be in the normal position.
2.2.4 Switch 4, Link Loss Forwarding
Link loss forwarding enables the state of the serial WAN port to be reflected in the
user Lan ports. If LLF is enabled, and the WAN port fails the LAN ports will also be
changed to the down state to alert upstream equipment there is a problem.
2.2.5 Switch 5, Max Frame Size
The WC-Serial supports a maximum frame size of 2048 bytes, however for
compatibility with legacy systems this may be limited to 1518/1522 bytes.
ON
Max Packet Size 2048 bytes
OFF Max Packet Size, 1518 Untagged, 1522 Tagged
