Cisco UBR904 Troubleshooting Guide - Page 3

Platforms, Prerequisites, Supported MIBs and RFCs - cable modem

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List of Terms usable in the upstream direction. Numbers indicate number of code points per symbol. The QAM rate or the number of points in the QAM constellation can be computed by 2 raised to the power of . QPSK-Quadrature Phase-Shift Keying. A method of modulating digital signals onto a radio-frequency carrier signal using four phase states to code two digital bits. Ranging-The process of acquiring the correct timing offset such that the transmissions of a cable modem are aligned with the correct mini-slot boundary. SID (Service ID)-A number that defines (at the MAC sublayer) a particular mapping between a cable modem (CM) and the CMTS. The SID is used for the purpose of upstream bandwidth allocation and class-of-service management. Subscriber Unit (SU)-An alternate term for cable modem. See cable modem. Upstream-The set of frequencies used to send data from a subscriber to the headend. Platforms The uBR904 cable modem is a standalone device; it works in conjunction with the Cisco uBR7246 universal broadband router. Prerequisites See the companion to this document, "Bridging and Routing Features for the Cisco uBR904 Cable Modem" for information regarding prerequisites. Supported MIBs and RFCs See the companion to this document, "Bridging and Routing Features for the Cisco uBR904 Cable Modem" for information regarding supported MIBs and RFCs. Troubleshooting Tips for the Cisco uBR904 Cable Modem 3

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List of Terms
Troubleshooting Tips for the Cisco uBR904 Cable Modem
3
usable in the upstream direction. Numbers indicate number of code points per symbol. The QAM
rate or the number of points in the QAM constellation can be computed by 2 raised to the power of
<number of bits/symbol>.
QPSK
—Quadrature Phase-Shift Keying. A method of modulating digital signals onto a
radio-frequency carrier signal using four phase states to code two digital bits.
Ranging—
The process of acquiring the correct timing offset such that the transmissions of a cable
modem are aligned with the correct mini-slot boundary.
SID (Service ID)
—A number that defines (at the MAC sublayer) a particular mapping between a
cable modem (CM) and the CMTS. The SID is used for the purpose of upstream bandwidth
allocation and class-of-service management.
Subscriber Unit (SU)
—An alternate term for cable modem. See
cable modem.
Upstream
—The set of frequencies used to send data from a subscriber to the headend.
Platforms
The uBR904 cable modem is a standalone device; it works in conjunction with the Cisco uBR7246
universal broadband router.
Prerequisites
See the companion to this document,
“Bridging and Routing Features for the Cisco uBR904 Cable Modem”
for information regarding prerequisites.
Supported MIBs and RFCs
See the companion to this document,
“Bridging and Routing Features for the Cisco uBR904 Cable Modem”
for information regarding supported MIBs and RFCs.