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Configuring the Cisco uBR900 Series Cable Access Routers 101
Scrambler Seed 15-bit seed value loaded at the beginning of each burst after the register has been
cleared. Not used if scrambler is off.
Maximum Burst Size Maximum number of mini-slots that can be transmitted during this burst type. When
the interval type is Short Data Grant, this value must be greater than 0. If this value is
0, the burst size is limited elsewhere.
Guard Time Size Amount of time in symbols between the center of the last symbol of a burst and the
center of the first symbol of the preamble of an immediately following burst in an
upstream transmission from the Cisco uBR900 series to the CMTS.
Last Codeword Length Indicates whether or not the length of the last codeword is fixed or shortened.
(1 = fixed; 2 = shortened)
Scrambler on/off Indicates whether or not a scrambler is enabled in the upstream modulator.
(1 = on; 2 = off)
Network Access Indicates whether or not the Cisco uBR900 series has access to the HFC network.
Vendor ID Unique identifier specifying the cable modem manufacturer.
Auth. Wait Timeout Number of seconds the Cisco uBR900 series waits for a reply after sending the
Authorization Request message to the CMTS.
Reauth. Wait Timeout Number of seconds the Cisco uBR900 series waits for a reply after it has sent an
Authorization Request message to the CMTS in response to a reauthorization request
or an Authorization Invalid message from the CMTS.
Auth. Grace Time Number of seconds before the current authorization is set to expire that the grace
timer begins, signaling the Cisco uBR900 series to begin the reauthorization process.
Op. Wait Timeout Number of seconds the TEK state machine waits for a reply from the CMTS after
sending its initial Key Request for its SID’s keying material.
Retry Wait Timeout Number of seconds the TEK state machine waits for a replacement key for this SID
after the TEK grace timer has expired and the request for a replacement key has been
made.
TEK Grace Time Number of seconds before the current TEK is set to expire that the TEK grace timer
begins, signaling the TEK state machine to request a replacement key.
Auth. Reject Wait Time Number of seconds the Cisco uBR900 series waits before sending another
Authorization Request message to the CMTS after it has received an Authorization
Reject message.
Assigned SID Service ID assigned by the CMTS for the corresponding service class.
Max Downstream Rate Maximum downstream rate in bits per second that the CMTS is permitted to forward
to CPE unicast MAC addresses learned or configured as mapping to this
Cisco uBR900. (This does not include MAC packets addressed to broadcast or
multicast MAC addresses.)
Max Upstream Rate Maximum upstream rate in bits per second that the Cisco uBR900 series is permitted
to forward to the RF network. This includes packet PDU data packets addressed to
broadcast or multicast addresses.
Upstream Priority Relative priority assigned to this service class for data transmission in the upstream
channel. Higher numbers indicate higher priority.
Min Upstream Rate Date rate in bits per second that will be guaranteed to this service class on the
upstream channel.
Max Upstream Burst Maximum transmit burst in bytes allowed for this service class on the upstream
channel.
Privacy Enable Indicates whether or not Baseline Privacy is enabled for this service class.
Table 12 show controllers cable-modem MAC State Field Descriptions (continued)
Field Description