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Step 2
Step 3
Note
Step 4
Figure 3-15
Faceplate
Faceplate
Frame Relay Card Redundancy
Optional redundancy on a Frame Relay port is possible with a second FRM/FRI card set and a
Y-cable connection on each applicable port. The section ""Setting Up Frame Relay Ports and
Connections (FRM)" page 34. includes the step for configuring Y-cable redundancy. The card
redundancy kit contains a second FRM/FRI card set, Y-cables to interconnect the ports on the two
back card, and four, 200-ohm DCE/DTE jumper cards if the back cards are either FRI-V.35s or
FRI-X.21s. (The DCE or DTE port applies to only V.35 or X.21 interfaces.) Make sure that the
firmware revision of the FRM in the kit matches the firmware in the installed FRM. Model firmware
supports V.35 and X.21 interfaces. Model E firmware supports T1 and E1 interfaces.
When you install a redundant card set with either a V.35 or X.21 interface, you must change the
daughter cards on the existing FRI that specify DCE or DTE mode at each port. Install the higher
impedance (200 ohms) version cards that are in the Y-cable kit.
Y-cable redundancy is not allowed between inconsistent back card types, such as an FRI T1 and an
FRI V.35. The dspyred display shows any conflict in reverse video. (Refer also to the descriptions
of the upcln and upfrport commands in the Cisco WAN Switching Command Reference.)
To change to DTE, move the jumper board one row of pins away from the FRI faceplate.
(See Figure 3-15.) For DTE mode, the jumper board should occupy rows 2, 3, 5, and 6.
To change to DCE, plug the jumper board into the connector receptacle pin rows closest
to the FRI faceplate. (See Figure 3-15.) The rows for DCE mode are 1, 2, 4, and 5.
Insert the FRI card and gently slide it in all the way to the rear of the slot.
The FRI card should slide in easily into the slot. Investigate any binding. Do not use force.
Insert and tighten the mounting screws.
Setting the Port Mode (DTE/DCE) on an FRI
DTE position
1 2 3 4 5 6
DCE position
1 2 3 4 5 6
DCE/DTE
jumper board
FRI
DCE/DTE
jumper board
FRI
Card Installation and Node Startup 3-33
Making Frame Relay Connections
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