Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Setting Quality of Service (QoS) for Higher Priority Traffic
The show interface cable x/y upstream port # command is also enhanced to reflect the current state of
the new MAC scheduler for the specified upstream port as shown in the following example:
cmts# show interface cable 1/0 upstream 0
Cable1/0: Upstream 0 is up
Received 68 broadcasts, 0 multicasts, 20811 unicasts
0 discards, 99 errors, 0 unknown protocol
20879 packets input, 0 corrected, 0 uncorrectable
99 noise, 0 microreflections
Total Modems On This Upstream Channel : 2 (2 active)
Default MAC scheduler
Queue[Cont Mslots] 1/104, fifo queuing, 0 drops
Queue[Rng Polls] 0/20, fifo queuing, 0 drops
Queue[CIR Grants] 0/20, fair queuing, 0 drops
Queue[BE Grants] 0/30, fair queuing, 0 drops
Queue[Grant Shpr] 0/30, calendar queuing, 0 drops
Reserved slot table currently has 5 CBR entries
Req IEs 176103, Req/Data IEs 0
Init Mtn IEs 540, Stn Mtn IEs 101
Long Grant IEs 10042, Short Grant IEs 405
Total channel bw reserved 200000 bps
CIR admission control not enforced
Current minislot count : 2099853 Flag: 1
Scheduled minislot count : 2100020 Flag: 1
The show interface sid command is also enhanced to display the type of SID—whether it is “Static”
versus “Dynamic”.
cmts# show interface cable x/y sid
You can optimize the physical layer parameters on an upstream channel. An example is provided for
physical layer parameters that can be used on the CMTS for upstream channels expected to support high
priority traffic density. These parameters minimize the physical layer overhead encountered for each
fixed sized (89 bytes) packet. The resulting fine tuning gives a direct improvement in the number of CBR
high priority connections that can be admitted on a single upstream channel.
Configure the following settings for the upstream channel to maximize the number of CBR
connections:
• Minislot size: 8
• Symbol rate: 1280 Ksymbols/sec
• Modulation type: QPSK
• Preamble length: 72 bits
• FEC (T bytes): 2 bytes
• FEC codeword length: 52 bytes
• Guard time: 8 symbols
• Last codeword: shortened last codeword
Sid Prim
Sid
Type Online
State
Admin
Status
QoS Create
Time
IP Address MAC Address
2 stat online enable 4 12:10:25 1.11.51.37 0010.7b6b.722d
4 2 dyn online enable 5 12:10:30 1.11.51.37 0010.7b6b.722d