Specifications

2-68
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Frame Relay Module
Note FRM front cards exist in two forms. One uses an ACM1 adapter. The other is a single-card or “native”
version. Functionally, they are identical. For the single-card version, you must use FRM firmware
version V or later.
Frame Relay Interface V.35 and X.21 Back Cards
Both the Frame Relay interface V.35 (FRI-V.35) and X.21 (FRI-X.21) back cards provide the FRM with
interfaces to user equipment. The FRI-V.35 provides four V.35 interfaces, and the FRI-X.21 provides
four X.21 interfaces. Port operating rates and composite data rates for the two interface types are the
same, and most configuration tasks require the same procedures.
For a description of the FRI-V.35 back card faceplate, see Figure 2-30. For a description of the FRI-X.21
back card faceplate, see Figure 2-31.
Y-Cable Redundancy
The Y-cable redundancy kits for the FRI-X.21 and FRI-V.35 contain four extra daughter cards for
specifying individual ports as either DCE or DTE. The extra daughter cards are 200-ohm versions for
the FRI already installed. The higher impedance cards are necessary to maintain proper termination
impedance when the two interfaces are in parallel (by way of the Y-cable).
Port Modes
You can configure the port (DCE or DTE) on an FRI back card using the position of a jumper card on
the back card. See the “Preparing the Cards” section on page 3-1 in the Cisco IGX 8400 Series
Installation Guide for more information.
For more information on the FRI-V.35 back card, see the “FRI-V.35 Back Cards” section on page 2-68.
For more information on the FRI-X.21 back card, see the “FRI-X.21 Back Card” section on page 2-69.
FRI-V.35 Back Cards
Both models of the FRI-V.35 have the following functions and features:
• Enhanced V.35 loopback testing
• T1 and E1 FR port interfaces
• Provides 1 to 4 FR interfaces via 34-pin MRAC connector (Winchester, female)
• Support for RTS, CTS, DSR, DTR, DCD, LLB, RLB, and TM control leads
• Handles up to 252 virtual circuits per card
• Provides hardware jumpers on daughter board to configure the interface as DCE or DTE
• Card redundancy option provided by Y-cable and standby card pair.
• Support for normal and looped clocking
For a description of the back card faceplate, see Figure 2-30.