Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters
Command Reference
85
Cisco IOS Release 12.2(15)CZ
T2 Timeouts Number of timeouts caused by the router not receiving a maintenance
broadcast for ranging opportunities from the CMTS within a specified
time.
T3 Timeouts Number of timeouts caused by the router not receiving a response within
a specified time from the CMTS to a RNG-REQ message during initial
maintenance.
T4 Timeouts Number of timeouts caused by the router not receiving a response within
a specified time from the CMTS to a periodic maintenance request.
Range Aborts Number of times the ranging process was aborted by the CMTS.
DS ID Identifier of the downstream channel on which this MAC management
message has been transmitted. This identifier is arbitrarily chosen by the
CMTS and is unique only within the MAC-sublayer domain.
DS Frequency Downstream frequency acquired by the router during its last initialization
sequence.
DS Symbol Rate Downstream frequency in symbols per second.
DS QAM Mode Downstream modulation scheme being used by the router.
DS Search Frequency bands scanned by the router when searching for a downstream
channel. The router’s default frequency bands correspond to the North
American EIA CATV channel plan for 6-MHz channel slots between
90 MHz and 858 MHz.
US ID Identifier of the upstream channel to which this MAC management
message refers. This identifier is arbitrarily chosen by the CMTS and is
unique only within the MAC-sublayer domain.
US Frequency Transmission frequency used by the router in the upstream direction.
US Power Level Transmit power level of the router in the upstream direction.
US Symbol Rate Upstream frequency in symbols per second.
Ranging Offset Delay correction (in increments of 6.25 microseconds/64) applied by the
router to the CMTS upstream frame time derived at the router. Used to
synchronize the upstream transmissions in the time division multiple
access (TDMA) scheme, this value is roughly equal to the round-trip
delay of the router from the CMTS.
Mini-Slot Size Size T of the mini-slot for this upstream channel in units of the timebase
tick of 6.25 microseconds. Allowable values are 2, 4, 8, 16, 32, 64, or 128.
Change Count Incremented by 1 by the CMTS whenever any of the values of this channel
descriptor change. If the value of this count in a subsequent upstream
channel descriptor (UCD) remains the same, the router can quickly decide
that the remaining fields have not changed, and may be able to disregard
the remainder of the message.
Preamble Pattern Byte pattern used for the preamble.
Burst Descriptor: Compound Type/Length/Value (TLV) encoding that defines, for each type
of upstream usage interval, the physical-layer characteristics that are to be
used during that interval. Each burst descriptor is given an identifying
number.
Table 9 show controller cable-modem mac state Field Descriptions (continued)
Field Description