Fddi Connections - Cisco 7000 Series Hardware Installation And Maintenance Manual

Connecting Interface Cables
TRIP
The speed of each Token Ring port must match the speed of the ring to which it is connected. The
default speed for all TRIP ports is 4 Mbps, which you can change to 16 Mbps on any port with the
configuration command ring-speed n, where n is the speed (4 or 16) in Mbps. Before you enable the
Token Ring interfaces, ensure that each is set for the correct speed, or it can bring the ring down. The
following sample session changes the ring speed on Token Ring port 1/2 from the default 4 Mbps to
16 Mbps:
Caution
connected, either 4 or 16 Mbps. If the port is set for a different speed, it will cause the ring to beacon,
which effectively brings the ring down and makes it inoperable.

FDDI Connections

Both single-mode and multimode connections are available and can be combined on one FIP. The
fiber-optic cable connects directly to the FIP ports. Single-mode uses separate transmit and receive
cables. You will need two single-mode cables for a single-attach connection, or four cables for a
dual-attach connection. Multimode uses one integrated transmit/receive cable for each physical
interface (one for PHY A and one for PHY B). You will need one multimode cable for a
single-attach connection, and two cables for a dual-attach connection. Figure 3-17, which shows the
connections for a dual-attach connection that uses both single-mode and multimode fiber, illustrates
the types of connections used for both fiber modes. For cable and connector descriptions, refer to the
section "FDDI Connection Equipment" in the chapter "Preparing for Installation."
Note
The stream is based on the signal flow on the primary ring. A station receives the primary signal from
its upstream neighbor and transmits the primary signal to its downstream neighbor.
3-16 Cisco 7010 Hardware Installation and Maintenance
7010# configure terminal
int tokenring 1/2
ring-speed 16
^Z
7010# write memory
[OK]
Each TRIP port must be configured for the same ring speed as the ring to which it is
Each station in a ring refers to its neighbor stations as upstream or downstream neighbors.
MAU