As per my last post, I will show here the basic configuration of how to get FDMA working on a Lot 10 CPN. All CECOM documentation only shows how to get a JNN working, but (as CPNs don’t have a GPS to provide timing) we have to do things differently.
Cabling
- TFOCA-2 runs from Port 1 on the LOS case to J1 on the STT. In our LOS case, we had to use the spare fiber pair to connect to the CTM-100/C.
- Serial cable connects from NT2R Serial0/0/0 to the LOS case’s Channel 1 Red.
- Serial patch from Port 1 NRZ to Channel 1 Black (all on the LOS case).
- FDMA modem and CTM-100/C installed as labeled in the STT.
- KIV-7M installed as labeled in the LOS case, COMSEC loaded, and strappings matching the HUB.
CTM-100/C Configurations
The following setup will allow your CTMs to pull timing through your FDMA modem.
| SETTINGS | LOS CASE | STT |
|---|---|---|
| Mode | Fiber | Fiber |
| Input | NRZ | NRZ |
| Rate | ||
| NRZ Mode | EIA530A | EIA530A |
| NRZ Config | DCE/EXT | DTE/EXT |
| NRZ Clock | ——- | TXC |
| Clock Source | Fiber | Input |
| Status (when complete) |
NT2R Configuration
- Remove “passive-interface Loopback0” from the OSPF configuration.
- Add a network statement to include the Hub’s NT2R (e.g. “network 144.104.201.224 0.0.0.0 area 0”). The IP of the Hub’s NT2R should be visible in your routing table, as it is a directly connected network via Serial0/0/0 (shown in the yellow box below).
Conclusion
That should be it. If any additional configuration is required, it is Hub-specific and not something we came across. If additional help is required, I can be contacted via this blog (must use a mail.mil email address).
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