Specifications

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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
Data Clocking on the FRI-V.35 Back Card
The FRI-V.35 back card supports both normal and looped clocking modes. However, the direction for
clock and data flow will differ, depending on whether the FRI-V.35 back card is configured as DCE or
DTE. Use the following rules to determine how clocking is conducted in different clocking modes:
• If the FRI-V.35 back card is DCE with normal clocking, the FRI-V.35 back card provides both
transmit and receive clocks to the connected user device.
• If the FRI-V.35 back card is DTE with normal clocking, the connected user device provides both
transmit and receive clocks to the FRI-V.35 back card.
• If the FRI-V.35 back card is DCE with looped clocking, the connected user device provides the
transmit clock on the EXT XMT CLK line, while the FRI-V.35 back card provides the receive clock
to the connected user device.
• If the FRI-V.35 back card is DTE with looped clocking, the FRI-V.35 back card provides the
transmit clock on the EXT XMT CLK line, while the connected user device provides the receive
clock to the FRI-V.35 back card.
See Figure 2-32 for a visual description of these two clocking modes.
Table 2-43 Maximum Throughputs with the FRI-V.35 Back Card
Maximum
Throughput with
1 Port
Maximum
Throughput with
2 Ports
Maximum
Throughput with
3 Ports
Maximum
Throughput with
4 Ports
2048 or
1920 kbps
1024 kbps/port 672 kbps/port 512 kbps/port