CTC Union ET100A, User Manual

Page: 14 / 34

ET100A LAN-WAN Bridge
When the HDLC or PPP packet is received on the remote side unit's
data port, the packet is checked for transmission errors, then the original
Ethernet packet(s) is recovered and sent out the remote's LAN port
completing the transmission. Here is the typical application of the
ET100A .
ET100A/V35
ET100A/V35
Figure 3. Typical application of ET100A LAN ‐ WAN Bridge.
Many times the
ET100A
is commonly referred to as an Ethernet to
V.35, Ethernet to X.21, or Ethernet to Datacom 'converter'. As a
sales/marketing term or non ‐ technical reference, the term is OK. However,
from a technical standpoint, the term is a misnomer. The Ethernet is not
"converted" to V.35, it is run "over" the V.35 link. Conversion also implies
that the interface can work both ways. This is NOT the case for the
LAN ‐ WAN Bridge as the following application shows.
ET100A/V35
ET100A/V35
Figure 4. Application NOT ALLOWED for ET100A.
14