1-14threshold, the fans are rotating only at half of the speed (50%). When a fan stops rotating, the fancontroller alarms. The alarm and state LEDs of the FAN are located on the front panel of MPUF.AppearanceThe following figure shows a FAN module, taking MSR 50-60 for example.Figure 1-13 FAN module (the MSR 50-60)SIC/DSIC and FIC/DFIC Interface CardsMSR 50 series routers adopt modular design and support a wide range of optional SIC/DSIC andFIC/DFIC interface cards, providing various interfaces, such as synchronous/asynchronous serialinterface, Ethernet interface, E1/T1, ISDN BRI/PRI, ADSL, audio interface, Layer 2 switching interface,and so on.For details about the interface cards, refer to MSR Series Routers Interface Card and Interface ModuleManual.For an MSR 50 series router, 4FSW/1FEA/1GEC/1ADSL/1ADSL-I can only be installed in Slot 2 or Slot4.ESM Modulez High-performance network data encryption ESM module (ESM-ANDE)z Standard network data encryption ESM module (ESM-SNDE)ESM module supports IPSec and by using hardware encryption expedites IP packet encryption. Theuse of hardware encryption/decryption and hashing operation allows the router to encrypt packets withhigh performance and reliability.The encryption card is optional. On a router installed with an encryption card, the main control boardfunctions to route IP packets and implement encryption-enabled VPN, while the encryption cardfunctions to encrypt packets.
