Specifications

1-4 Cisco Multiport Router Hardware Installation and Configuration Guide
Port Configuration
Port Configuration
The asynchronous/synchronous ports are configured as either asynchronous or
synchronous. The default is a synchronous port configuration.
Asynchronous/Synchronous Port Features
The low-speed asynchronous/synchronous ports connect terminals, printers, modems,
microcomputers, and remote LANs over asynchronous serial lines to an internetwork, or to
synchronous devices such as DSU/CSUs on the same ports. The asynchronous/
synchronous ports support data transmission rates of up to 115.2 kbps on the following
serial interfaces:
• EIA/TIA-232
• EIA/TIA-449
• EIA-530
• V.35
• X.21
Note EIA/TIA-232 and EIA/TIA-449 were known as recommended standards RS-232
and RS-449 before their acceptance as standards by the Electronic Industries Association
(EIA) and Telecommunications Industry Association (TIA).
The multiport serial routers support numerous protocols. The following are examples of
some of the low-speed synchronous and asynchronous protocols:
• Autobaud
• Bisync
• Frame Relay
• Half-duplex operation
• HDLC