H3C Technologies H3C MSR 50 - Manual (Page 22)

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temperature of the system can maintain. The routing speed of the fans is adjusted by the fan controller on
the main control board and between 50% and 100% depending on the system temperature. When the
system temperature rises above the high-temperature threshold set by the fan controller, the fans are
rotating at full speed (100%); when the system temperature drops below the low-temperature threshold,
the fans are rotating only at half of the speed (50%). When a fan stops rotating, the fan controller alarms.
The alarm and state LEDs of the FAN are located on the front panel of MPUF.
Appearance
The following figure shows a FAN module, taking MSR 50-60 for example.
Figure 15 FAN module (the MSR 50-60)
SIC/DSIC and FIC/DFIC Interface Cards
MSR 50 routers adopt modular design and support a wide range of optional SIC/DSIC and FIC/DFIC
interface cards, providing various interfaces, such as synchronous/asynchronous serial interface,
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 Module Manual.
NOTE:
•
For an MSR 50 router, SIC-4FSW/1FEA/1GEC/1ADSL/1ADSL-I can only be installed in Slot 2 or Slot
4 on the MPUF.
• Interface cards that support PoE can be used for remote power supply only if they are installed on the
PoE models; otherwise, the interface cards that support PoE can only function as normal switching
modules if they are used on non-PoE models.
ESM Module
• High-performance network data encryption ESM module (ESM-ANDE)
• Standard network data encryption ESM module (ESM-SNDE)
ESM module supports IPSec and by using hardware encryption expedites IP packet encryption. The use
of hardware encryption/decryption and hashing operation allows the router to encrypt packets with high
performance and reliability.
The encryption card is optional. On a router installed with an encryption card, the main control board
functions to route IP packets and implement encryption-enabled VPN, while the encryption card functions
to encrypt packets.