About This Guide xi
•Double-density modem module (DMM)—Each double-density modem card contains 12 DMM
SIMMS. Each DMM SIMM contains 12 digital modems.The CiscoAS5800 has the capability
of terminating up to 1,344 modem connections when equipped with 10 double-density modem
cards and 2 CT3 trunk cards.
•Egress interface—The ro ut er sh elf interface to a network, such as the In t er n et or a co r por a te
intranet or backbone. Supported interfaces include Fast Ether net, HSSI, FDDI, and ATM
interfaces.
•Front and rear—The front of the dial shelf is defined as the card-insertion side and provides
access to the line card s and the blower assembly. The rear or back of the dial shelf is defined as
the power-entry side and provides access to the filter module and two power-entry modules.
•I/O controller card—The router shelf card containing the system I/O controller .
•Ingress interface—Dial shelf cards that connect to the telco network and contain the necessary
functionality to terminate a telco connection. The ingress interface terminates digital calls at the
dial shelf. The CiscoAS5800 currently supports CE1, CT1 and CT3 ingress interfaces.
•Maintenance bus (MBus)—Used in the dial shelf to monitor –48 VDC from both DC power
supplies using analog isolation circuits.
•Modem card—A printed circuit board that connects to the dial shelf backplane and cont ains hex
modem module SIMMs. Its primary purpose is conversion between pulse code modulation
(PCM)-encoded analog bitstreams on the backplane TDM bus an d pack et ized di git al dat a on the
backplane interconnect. The modem card terminates incoming analog calls at the dial shelf.
•Network processor card—The router shelf card containing the network processi ng engine (NPE).
•Online insertion and removal (OIR)—A feature that allows you to insert and remo ve modules and
cards without interruption to service while the system is powered on.
•Pulse code modulation (PCM)—A specific way of representing an analog wave form in digital
format.
•Power-entry module (PEM)—A –48 VDC power supply module.
•Router shelf—The host route processing functionality for the dial shelf. The router shelf carries
data between the dial s helf and an external networ k, such as the Internet. F ull Cisco IOS software
functionality is pr ov id ed on th e router shelf.
•Time-division multiplexing bus ( TDM b us)— A dial sh elf propr iet ary s erial tele communic ation s
backplane that enables multiple channels of data to be transmitted over the same medium. The
TDM bus connects a DS0 channel (from the ingress interface) to an individual modem on the
modem card.
•Trunk card—A printed circuit board that connects to the dial shelf backpl ane and conta ins tru nk
circuitry, such as CT1 or CE1 interfaces. The trunk card acts as the ingress interface through
which all calls are received, and terminates incoming digital call s at the dial shelf.
Related Documentation
The CiscoIOS software running your Cisco AS5800 includes extensive features and functionality.
For information regarding the CiscoAS5800 that is beyond the scope of this document or for
additional information, use the following resources:
Timesaver Make sure that you have access to the documents listed in Table1. These documents
are available in print, on CD-ROM, and on the Wor ld W i de Web. If you need further assistance, see
the section “Cisco Connection Online.”
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