Cisco 2500 Series - Manual (Page 5)

Cisco 2500 Series Overview 1-9
Memory Configurations
Memory Configurations
The systems contain the following types of memory:
•
Primary memory (main memory)—Dynamic random-access memory (DRAM) that stores the
running configuration and routing tables.
•
Shared memory—Shared DRAM that is used for packet buffering by the router network
interfaces.
•
System-code memory—Flash or programmable read-only memory (PROM); stores the
operating system software image.
•
Boot ROM memory—Stores a subset of the operating system software image that is called the
system bootstrap image or the bootstrap program (or ROM monitor). The system bootstrap
image allows you to boot the router when Flash memory does not contain a valid system image.
The boot ROM prompt follows: Router(boot)>. The bootstrap program (ROM monitor) prompt
is the greater than sign (>), which differs from the user-level operating-system prompt of
router> . (For more information, see the appendix “Virtual Configuration Register,” and the
appendix “Bootstrap Program.”
•
Nonvolatile random-access memory (NVRAM)—Stores the system configuration file and the
virtual configuration register.
BRI ISDN
7
Basic Rate S/T (RJ-45) (2503, 2504, and 2516 only)
Console and auxiliary ports Asynchronous serial (RJ-45)
Operating environment 32 to 104
°F (0 to 40°C)
Nonoperating temperature -40 to 185
°F (-40 to 85°C)
Operating humidity 5 to 95%, noncondensing
Noise level 34 dBa @ 3' (0.914 m)
Agency approvals Safety: UL 1950, CSA 950, EN60950, TUV-GS-mark
EMI: FCC Class A, VCE Class B, Canadian DOC Class A,
EN55022 Class B (CISPR22 Class B), VCCI Class 2
1. BRI=Basic Rate Interface.
2. AUI=Attachment unit interface.
3. IEEE=Institute of Electrical and Electronic Engineers.
4. EIA/TIA=Electronic Industries Association/Telecommunications Industry Association. EIA/TIA-232 and
EIA/TIA-449 were known as recommended standards RS-232 and RS-449 before their acceptance as standards by
the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA).
5. NRZ/NRZI=Nonreturn to zero/Nonreturn to zero inverted.
6. DTE/DCE=Data terminal equipment/Data communications equipment.
7. ISDN=Integrated Services Digital Network.
Description Design Specification