Asynchronous/Synchronous Serial Connections; Ethernet Connections; Token Ring Connections - Cisco 2500 Series Installation And Configuration Manual

Preparing to Install the Router
Figure 2-6: EIA-530 Serial Transition Cable Connector, Network End

Asynchronous/Synchronous Serial Connections

The asynchronous/synchronous serial ports use the asynchronous/synchronous 60-pin connectors located
on the rear panel. The lower ports are labeled Serial 2 (A/S) and Serial 3 (A/S): the upper ports
(depending on which chassis you have) are labeled Serial 4 (A/S) through Serial 9 (A/S).
You must use a special serial cable to connect a multiport serial router to a modem or CSU/DSU. The
cable uses a DB-60 connector on the chassis end. See the appendix
pinouts. To order a cable, see the section
Router" chapter.

Ethernet Connections

The IEEE has established Ethernet as standard 802.3. The most common Ethernet implementations are as
follows:
10Base5 (AUI)--Ethernet on thick coaxial cable, also known as thick Ethernet. The maximum
segment distance is 1,640 feet (500 meters).
10Base2 (Thinnet)--Ethernet on thin coaxial cable, also known as thin Ethernet. The maximum
segment distance is 607 feet (185 meters).
10BaseT--Ethernet on unshielded twisted-pair (UTP) cable. The maximum segment distance is
328 feet (100 meters). UTP cables look like the cables used for ordinary telephones; however,
UTP cables meet certain electrical standards that telephone cables do not.
Your router includes an Ethernet AUI interface and a 10BaseT interface, which operates at speeds up to
10 Mbps.
The cables and transceivers required to connect the router to an Ethernet network are not included. For
ordering information, see the section
chapter.

Token Ring Connections

The two Token Ring ports are located on the rear panel of the Cisco 2521 and Cisco 2523 and are labeled
TOKEN RING or UTP. The port labeled TOKEN RING uses a standard 9-pin Token Ring lobe cable
and connects the multiport serial router directly to a media attachment unit (MAU). The Token Ring port
labeled UTP uses an RJ-45 Token Ring cable and is connected through an adapter or directly to a MAU.
Only one Token Ring port can be used at a time.
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2500/2520/2520_23/c2520pre.htm (11 of 13) [10/27/2000 3:07:41 PM]
"Obtaining Service and
"Obtaining Service and
"Cable Specifications" for cable
Support" in the "Overview of the
Support" in the "Overview of the Router"