Installation guide

Making External Connections to Cisco 4000 Series Routers 4-61
Network Connection Considerations
Figure 4-13 Token Ring Cable Connections
Serial Connections
When setting up your router, consider distance limitations and potential electromagnetic
interference (EMI) as defined in the Electronic Industries Association’s (EIA) and
Telecommunications Industry Association (TIA) standards, such as EIA/TIA-232.
Serial Line Distance Limitations
Serial signals can travel a limited distance at any given bit rate; generally, the slower the
baud rate, the greater the distance. All serial signals are subject to distance limits, beyond
which a signal degrades significantly or is completely lost. Table 4-5 lists the
IEEE-recommended maximum speeds and distances for each serial interface type;
however, you may get good results at speeds and distances greater than those listed. For
instance, the recommended maximum rate for V.35 is 2 Mbps, but 4 Mbps is commonly
Media attachment unit
I
EEE 802.5 connector
Token Ring
lobe cable
(not included)
9-pin
D connector
Router
(rear view)
Token Ring port
H1569a