- NVRAM and Clock Daughter card [CPU-7 only]
- Contains system clock
- Contains active system configuration in NVRAM
- Clock and NVRAM data constantly synchronizes with the redundant unit to allow for very fast switchovers.
- Support of CPU redundancy
- Provides a less-than 250 microsecond active to redundant CPU switchover times.
- Must be used with 893x series Interface cards.
IMACS CPU card
The IMACS CPU cards provide the intelligence for the system to control the high-speed system buses, provide signaling conversion capabilities, maintain alarm logs and communicate with external network management systems (NMS). The CPUs contain the system software which may be either Host Code version v6.x.y (880370) or v7.x.y (880770).
Host Code version 6.x.y supports all standard IMACS user cards, and additionally supports advanced server functionality for frame relay, low bit rate voice compression and IP routing. Both code versions provide on-board XCON (cross-connect) capability which supports up to eight full T1 or E1 WAN connections. Access up to 248 timeslots at 64 Kbps in each direction, non-blocking. On each El time-slot 0 is used for frame alignment & time-slot 16 is optionally used for signaling.
Both models of CPU support low-end or high-end functionality and offer single chassis CPU redundancy, fully supporting anywhere from two to eight full bandwidth T1/E1 links. The cross-connect on the CPUs provide up to 24 Mb/s of non-blocking cross-connect (total user bandwidth = 8 Mb/s, Total WAN bandwidth = 16 Mb/s). The CPU manages both the digital and analog signaling capabilities of the IMACS, as well as houseing the SNMP MIBS for all IMACS WAN and user cards.
As the primary interface into the IMACS chassis, the CPUs provide extensive diagnostic control for fault isolation and identification, as well as housing IP management host for TCP/IP connectivity.
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