Table 2. Feature History
|
Feature Name
|
Release Information
|
Feature Description
|
|
Support for RPHY GCP TLV 98.3 (BaseTargetRxPower)
|
Cisco IOS XE Cupertino 17.9.1w
|
This feature introduces TLV 98.3 support for cBR-8 routers. Use the base-power-rx-level-1_6Mhz option under cable upstream controller-profile controller-profile-number to enable the base power configuration for the entire upstream port.
|
In releases before Cisco IOS XE Cupertino 17.9.1w:
-
On cBR-8 routers, the MSOs have the option to configure the upstream power only at the upstream channel level on the RPD.
Cisco RPD solution implements the total absolute power per channel that is calculated with reference to 0dBmV/6.4 MHz. This
means that the total power of the entire upstream channel is always constant irrespective of the channel width and therefore
the power spectral density of the channel decreases for larger channels.
-
Upstream Power: Cisco RPD supports total absolute power per channel in reference to 0dBmV/6.4MHz. The total power of the entire upstream channel is always constant irrespective
of the channel width and therefore the power spectral density of the channel decreases for larger channels.
The implementation of upstream power for different channel widths is as specified below:
-
For the 1.6-MHz channel, power per 1.6MHz bandwidth is 0dBmV, total power is 0 dBmV.
-
For the 3.2-MHz channel, power per 1.6MHz bandwidth is -3dBmV, total power is 0 dBmV.
-
For the 6.4-MHz channel, power per 1.6MHz bandwidth is -6 dBmV, total power is 0 dBmV.
(Or)
-
For the 1.6-MHz channel, power per 6.4MHz bandwidth is +6dBmV, total power is 0 dBmV.
-
For the 3.2-MHz channel, power per 6.4MHz bandwidth is +3dBmV, total power is 0 dBmV.
TLV 98.3 BaseTargetRxPower
Starting with Cisco IOS XE Cupertino 17.9.1w, TLV 98.3 is supported on cBR-8 routers.
-
If the target rx base power is configured on an upstream RF port in cbr8, upstream power calculations are done with reference
to 1.6MHz bandwidth per the CableLabs specification.
-
The upstream base power configuration is configured on cbr8 in units of dBmV per 1.6MHz bandwidth. The total channel power
increases with increasing channel width.
-
The DOCSIS CableLabs specification defines TLV 98.3 as: This attribute is used to configure the base target power reference level for upstream signals received on all upstream channels
from the selected US RF port. The value of this attribute is specified as average power in units of 0.1 dBmV per 1.6 MHz of
RF bandwidth.
-
The supported range for TLV 98.3 is from -200 to +400 (-20 dBmV to +40 dBmV] per 1.6 MHz of RF spectrum per the CableLabs
specification.
-
The actual range supported by the Cisco RPD for this TLV 98.3 attribute varies based on the rpd type and is specified in the
cli helpstrings during configuration of this parameter.
-
The OOB-55d1 feature uses a constant value for VGA gain setting from internal calibration data. It does not follow the change
in port VGA due to any DOCSIS channel power level configuration changes. The per channel gain can be modified to compensate
for VGA port gain changes for tlv98.3 configuration on OOB-55d1 channels. We do not support setting up the power adjust for
55-D2 US channels.
-
In releases before Cisco IOS XE Cupertino 17.9.1w, the NDR/NDF feature power adjust follows the change in VGA gain settings.
In Cisco IOS XE Cupertino 17.9.1w and later, the power adjust for NDR/NDF in TLV 95.5 follows similar behavior with change
in VGA if any from TLV 98.3.
-
With TLV 98.3 enabled, the per channel power config TLVs are true power adjusts. The TLVs for different upstream channel types are the following:
-
UsScQamChannelConfig.TargetRxPowerAdjust (TLV 65.9)
-
UsOfdmaChannelConfig.TargetRxPowerAdjsut (TLV 66.13)
-
UsOob55d1.TargetRxPowerAdjust (TLV 92.7)
-
NdrConfig.TargetRxPowerAdjust (TLV 95.5)
Table 3. TLV 98.3 BaseTargetRxPower Supported Releases
|
Platform
|
Release
|
|
c-BR8
|
Cisco IOS XE Cupertino 17.9.1w and later
|
|
Cisco RPHY
|
RPD v10.4. Supported on Cisco RPD 1x2, 3x6, and 6x12
|
Note
|
TLV 98.3 BaseTargetRxPower does not support HAshelf and cnBR.
|
RPD Modules for TLV 98.3 BaseTargetRxPower
-
RPD has a port level amplifier VGA which affects the power levels on the entire upstream RF port – for all the channels on
the US port.
-
RPD also has a module that is called nb-gain which is used to fine tune the per-channel power adjustments if any configured
on the core.
-
TLV 98.3 defines the upstream power for the whole port – it is used to directly configure the value of the VGA on the RPD.
-
With TLV 98.3 enabled, the per-channel power adjusts on the core directly modifies the nb-gain for that channel on the RPD
and has no effect on the overall port power.
In releases before Cisco IOS XE Cupertino 17.9.1w, Cisco RPD supports total absolute power per channel in reference to 0dBmV/6.4MHz. This means that the total power of the entire upstream channel is always constant
irrespective of the channel width and therefore the power spectral density of the channel decreases for larger channels.
At the RPD upstream port (service group) level, the Remote PHY standard allows a CCAP core to configure a base target power
reference level for all upstream signals from a given US RF port. This reference level is specified as a power spectral density
(dBmV per 1.6 MHz) through GCP TLV 98.3, which corresponds to UsRfPort.BaseTargetRxPower.
The allowed range for upstream controller port base power configuration per CableLabs specification is -20 to +40 dBmV/1.6MHz.
Cisco RPD 1x2 supports only the following ranges for the tlv98.3 configuration: -10 to +29 dBmV/1.6MHz for rphy-node and -25
to +10 dBmV/1.6MHz for rphy-shelf. Since there can be multiple RPDs per upstream controller port, you must pay attention to
the RPD-specific capabilities, to correctly configure the base port power values. The software does not restrict the configuration
to allow multiple RPD vendors using the same upstream controller profile. You can reconfigure the power levels at the per-channel
level appropriately.
US RF Port Power Command
cBR-8 routers support RPHY GCP TLV 98.3 - BaseTargetRxPower for the upstream controller port on the RPD. The base power config
can be applied to both cable upstream controller-profile and cable rpd level. If configured at both levels, the configuration at the cable rpd level takes priority for that rpd. SUP HA is supported for this TLV. The new CLI for upstream controller profile to configure
upstream RF port base power (TLV 98.3)
Use the base-power-rx-level-1_6Mhz option (Base target power level in units of dBmV/1.6MHz) under cable upstream controller-profile to enable base power configuration for the entire upstream port. base-power-rx-level-1_6Mhz - Base target power level in in units of dBmV/1.6MHz.
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#base-power-rx-level-1_6Mhz ?
<-20 - 40> Supported ranges: -10~29 for rphy-node, -25~10 for rphy-shelf(ref pt:0dBmV/1.6Mhz)
Note
|
|
With TLV 98.3 enabled, the existing CLI is overloaded to implement changes for per-channel power TLV 65.9 / 66.13
NDR/NDF channel power adjusts are already true power adjusts.
Capture power levels per 6.4MHz or simply power adjust levels per 1.6MHz depending on whether the base-power-rx-level-1_6Mhz is configured.
If base-power-rx-level-1_6Mhz is configured, then per-channel CLI has enhanced help strings for clarification:
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#us-channel 0 power-level ?
<-13 - 25> Power level in dBmV-total power in PSD 6.4Mhz if base-power-rx-level-1.6Mhz NOT
configured(-4~25 for rphy- node, -13~23 for rphy-shelf) [OR] true power adjust if
base-power-rx-level-1_6Mhz configured
Here us-channel indicates Upstream channel configuration and power-level indicates Input power level.
Note
|
The end-user is responsible for reconfiguring the individual upstream channel power levels as needed if the upstream RF port
base power configuration is enabled.
|
US RF Port Power CLI - RPD Configuration Level
To configure upstream RF port base power (TLV 98.3) at the RPD level, use the base-power-rx-level-1_6Mhz option under cable rpd to enable base power configuration.
router(config)#cable rpd node1
router(config-rpd)#identifier aaaa.bbbb.cccc
router(config-rpd)#rpd-us 0 base-power-rx-level-1_6Mhz ?
<-20 - 40> Supported ranges: -10~29 for rphy-node, -25~10 for rphy-shelf(ref pt:0dBmV/1.6Mhz)
The RPD config CLI base power config allows per upstream RF port on that RPD as shown above. This gives you finer control
over a specific RPD's upstream port power.
The upstream port base power config can be applied to both rpd configuration block as well as the upstream controller profile
as shown earlier. If configured at both levels, the config in the rpd block takes precedence for the given rpd upstream RF
port.
The option to configure the base port power config at the profile level, affects all RPDs using that profile; while the configuration
at the cable rpd level fine tunes the base power configuration only for that upstream port on that RPD. It also takes precedence over the
profile configuration for base power if present.
Note
|
Configuring the base power using either of the preceding commands, trigger the TLV 98.3 message from CBR8 to RPD and the implementation
on RPD changes to reflect new power calculations based on 0dBmV/1.6MHz reference.
|
RPD Show Command
The RPD show vga CLI can be used to see the details of port power configurations including per port vga settings, per port per channel nb-gain
settings, per port TLV 98.3 settings and user configured values.
R-PHY#show vga
OOB US S/W VGA Gain:
Port0: 7
Port1: -16
OOB US Default Gain Calculated:
Port0: 7
Port1: 7
Enable Upstream Calibration: TRUE
Upstream Calibration - Port0: 6 0 Port1: 6 0
VGA of platform: CSHELF
VGA Setting: Power values below in reference to 0dBmV/6.4Mhz
Port0: 0x23 (-9db)
Port1: 0x10 (+10db)
NB-GAIN Setting:
Port 0 (SCQAM0)
receiver 0 : 36(0x24) adj:+1.0:+1.1 db
receiver 1 : 36(0x24) adj:+1.0:+1.1 db
receiver 2 : 32(0x20) adj:-0.1:+0.1 db
receiver 3 : 25(0x19) adj:-2.0 db
receiver 4 : 32(0x20) adj:-0.1:+0.1 db
receiver 5 : 32(0x20) adj:-0.1:+0.1 db
Port 1 (SCQAM1)
no scqam receiver configured in port 1
TLV 98.3 Setting:
Supp range for TLV 98.3: -200 to 100 TenthdBmV per 1.6MHz
Port 0 : Enabled
User Config value: 100
Port 1 : Disabled
User Config value: --
OFDMA pwrAdjust Setting:
Port 0
receiver 0 : 25(0x19) adj:-2.0 db
Port 1
Value not set as tlv98.3 disabled for this port
US RF Port Power Configuration Examples
Sample Profile Configuration Block with TLV 98.3 Enabled
The configuration on both the controller profile and rpd block is saved in NVRAM and available on reboot. SUPHA is supported
for TLV 98.3. The config under the cable rpd block for an rpd takes precedence over the controller profile config if the upstream
base power value is configured under both sections.
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#base-power-rx-level-1_6Mhz 10 << US Base target power level in units of dBmV/1.6MHz (tlv 98.3)
router(config-controller-profile)# us-channel 0 channel-width 3200000 3200000
router(config-controller-profile)# us-channel 0 docsis-mode atdma
router(config-controller-profile)# us-channel 0 power-level 5 << US target rx power adjust level in units of dBmV/1.6MHz (tlv 65.9)
Sample RPD Configuration Block with Tlv 98.3 Enabled
The base power config for rpd aaaa.bbbb.cccc, based on the following configuration is 50dbmV/1.6Mhz on upstream port 0 while
all the other rpds using profile 499 has the base power config on their upstream port 0 to be 10dBmV/1.6Mhz.
cable rpd node1
identifier aaaa.bbbb.cccc
rpd-us 0 base-power-rx-level-1_6Mhz 5
core-interface Te8/1/0
rpd-ds 0 downstream-cable 8/0/0 profile 2
rpd-us 0 upstream-cable 8/0/0 profile 499
...
...
Disabling TLV 98.3
Disabling TLV 98.3 via CLI causes cBR-8 to switch to legacy power implementation with reference to 0dBmV/6.4MHz
Note
|
All the RPDs MUST reboot if the 98.3 CLI above is disabled. Disabling TLV 98.3 can be done both at the controller profile
as well as cable rpd configuration level. If the RPD is not rebooted post disabling base power config on cbr8, upstream power
behavior on RPD is undefined.
|
Controller Profile
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#no base-power-rx-level-1_6Mhz
Warning: Upstream RfPort BasePower config removed on ctrlr profile. Please reboot ALL RPDs
associated with this profile manually otherwise the upstream power behavior is undefined
cable rpd configuration level
router(config)#cable rpd node1
router(config-rpd)#no rpd-us 1 base-power-rx-level-1_6Mhz
Warning: Upstream RfPort BasePower config removed. Please reboot this RPD manually otherwise the upstream power behavior is undefined
Clarifying help strings are used in per-channel upstream power CLI – the onus is on the user to configure the ‘per-channel’
CLI value accordingly. If the user removes the base power that is configured by issuing cli ‘no base-power-rx-level-1_6Mhz’,
the user MUST update the ‘per-channel power level’ to use the appropriate desired value.
MIBs Information
| Feature Name |
Release Information |
Feature Description |
|
Received power MIB Update for SCQAM and OFDMA channels
|
Cisco IOS XE Dublin 17.12.1y
|
In this release, the received power for all the upstream channels, SCQAM and OFDMA, will be reported in 1.6MHz reference.
It will also include an upstream RF port base power if configured (applicable to rphy only). The following MIBs have been
updated:
|
In the release Cisco IOS XE Dublin 17.12.1y, on CBR8, the per CM MIB reporting upstream channel received power - docsIf3CmtsCmUsStatusRxPower
and docsIf31CmtsCmUsOfdmaChannelRxPower - will now report the received power of the SCQAM and OFDMA upstream channels respectively
at 1.6MHz PSD reference per the cable labs specification. This is applicable to all CMs online on both ICMTS and RPHY line
cards. Also both the MIBs now also include the base power, if configured on the RPHY upstream RF port along with the per channel
power level in the Received Power reporting. The upstream RF port base power feature was introduced for RPHY cards in the
IOS-XE 17.9.1y release.
A sample MIB output of upstream received power implementation for the configuration is as specified below for different channel
widths for the release Cisco IOS XE Dublin 17.12.1y:
CBR8#show cable modem rpd name node2
MAC Address IP Address I/F MAC Prim RxPwr Timing Num I Dev
State Sid (dBmV) Offset CPE P Class
9058.515c.9e3c 9.8.8.64 C8/0/2/UB w-online(pt) 5 -0.25 1265 0 N CM
cable upstream controller-profile 22
base-power-rx-level-1_6Mhz -6
us-channel 0 channel-width 3200000 3200000
us-channel 0 docsis-mode atdma
us-channel 0 equalization-coefficient
us-channel 0 frequency 11400000
us-channel 0 minislot-size 2
us-channel 0 modulation-profile 223
no us-channel 0 shutdown
us-channel 1 channel-width 1600000 1600000
us-channel 1 docsis-mode atdma
us-channel 1 equalization-coefficient
us-channel 1 frequency 14600000
us-channel 1 minislot-size 4
us-channel 1 modulation-profile 223
no us-channel 1 shutdown
us-channel 2 channel-width 6400000 6400000
us-channel 2 docsis-mode atdma
us-channel 2 equalization-coefficient
us-channel 2 frequency 20000000
us-channel 2 minislot-size 1
us-channel 2 modulation-profile 223
no us-channel 2 shutdown
us-channel 3 channel-width 6400000 6400000
us-channel 3 docsis-mode atdma
us-channel 3 equalization-coefficient
us-channel 3 frequency 32400000
us-channel 3 minislot-size 8
us-channel 3 modulation-profile 223
us-channel 3 specsvl error-adaptive-profile 3
no us-channel 3 shutdown
us-channel 4 channel-width 3200000 3200000
us-channel 4 docsis-mode atdma
us-channel 4 frequency 24200000
us-channel 4 minislot-size 2
us-channel 4 modulation-profile 221
us-channel 4 shutdown
us-channel 5 channel-width 3200000 3200000
us-channel 5 docsis-mode atdma
us-channel 5 frequency 27400000
us-channel 5 minislot-size 2
us-channel 5 modulation-profile 221
no us-channel 5 shutdown
us-channel 12 docsis-mode ofdma
us-channel 12 subcarrier-spacing 25KHz
us-channel 12 modulation-profile 421
us-channel 12 frequency-range 40000000 85000000
us-channel 12 cyclic-prefix 128 roll-off-period 32
us-channel 12 symbols-per-frame 9
no us-channel 12 shutdown
CBR8#show cable modem 9058.515c.9e3c wideband channel
MAC Address IP Address I/F MAC DSxUS Primary
State WB
9058.515c.9e3c 9.8.8.64 C8/0/2/UB w-online(pt) 9x5 Wi8/0/2:0
CBR8#show cable modem 9058.515c.9e3c verbose | i Received Power
Received Power Delta (dBmV) : 0.00 0.00 0.00 0.00
Config Received Power(dBmV@chw) : -3.00 -6.00 0.00 0.00
Received Power(dBmV@chw) : -3.00 -6.00 0.00 0.00
Config Received Power(dBmV@1.6MHz) : -6.00 -6.00 -6.00 -6.00
Received Power(dBmV@1.6MHz) : -6.00 -6.00 -6.00 -6.00
Received Power Delta (dBmV) : -0.25
Config Received Power(dBmV@chw) : 0.00
Received Power(dBmV@chw) : -0.25
Config Received Power(dBmV@1.6MHz) : -6.00
Received Power(dBmV@1.6MHz) : -6.25
Associated MIB outputs:
server > snmpwalk -v2c -c <community_string> <cbr8_ip> docsIf3CmtsCmRegStatusMacAddr | grep 6324229
docsIf3CmtsCmRegStatusMacAddr.6324229 = 90 58 51 5c 9e 3c
SCQAM:
lwr-lnx-util-1:~ > snmpwalk -v 2c -c public 2.29.1.1 1.3.6.1.4.1.4491.2.1.20.1.4.1.3 | more
SNMPv2-SMI::enterprises.4491.2.1.20.1.4.1.3.4718593.494952 = INTEGER: -60
SNMPv2-SMI::enterprises.4491.2.1.20.1.4.1.3.4718593.494953 = INTEGER: -60
SNMPv2-SMI::enterprises.4491.2.1.20.1.4.1.3.4718593.494954 = INTEGER: -60
SNMPv2-SMI::enterprises.4491.2.1.20.1.4.1.3.4718595.494952 = INTEGER: -60
OFDMA: (Actual + config Received Power)
lwr-lnx-util-1:~ > snmpwalk -v 2c -c public 2.29.1.1 1.3.6.1.4.1.4491.2.1.28.1.4.1.1
SNMPv2-SMI::enterprises.4491.2.1.28.1.4.1.1.4718593.494955 = INTEGER: -62
SNMPv2-SMI::enterprises.4491.2.1.28.1.4.1.1.4718594.494955 = INTEGER: -60
Upstream Per-Channel TLVs
For the per-channel upstream power config, it captures either the total absolute power levels per 6.4MHz or true power adjust levels depending on whether the upstream base power command base-power-rx-level-1_6Mhz is configured. The per-channel command has enhanced help strings to display the changes if base-power-rx-level-1_6Mhz is configured.
Router (config-controller-profile)#us-channel 0 power-level ?
<-13 - 25> Power level in dBmV-total power in PSD 6.4Mhz if base-power-rx-level-1.6Mhz NOT
configured(-4~25 for rphy- node, -13~23 for rphy-shelf) [OR] true power adjust if
base-power-rx-level-1_6Mhz configured
Configuration With SC-QAM Upstream Channel
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#base-power-rx-level-1_6Mhz 10
router(config-controller-profile)# us-channel 0 channel-width 3200000 3200000
router(config-controller-profile)# us-channel 0 docsis-mode atdma
router(config-controller-profile)# us-channel 0 power-level 5
Here us-channel 0 power-level 5 indicates US target rx power adjust level - true power adjust with above upstream base power config(TLV 65.9).
For the per-channel upstream power config, if the base port power level is configured via TLV 98.3, the channel adjusts automatically
become true channel adjusts in Cisco 1x2 RPD. You must reconfigure the per-channel power adjust if needed by taking the new
port base power configuration into consideration.
NVGEN For cBR-8
All the upstream RF port base power configurations are nv-gened. The base power configuration is available in show running-configuration once you enable it. The default configuration for the CBR8 is the no version of the base power command for the TLV 98.3. If you do not enable the feature or explicitly disable the feature, then
the default configuration can be verified by using the no version of this feature in show running-config all.
For example, with no base power config on the upstream RF port, see the following sample outputs for the show run and the show run all:
Router#show run all | sec cable upstream controller-profile 3
cable upstream controller-profile 3
description Cox-upstream-prof-eg
no base-power-rx-level-1_6Mhz
cable def-phy-burst 0
us-channel 0 chan-class-id 7
us-channel 0 channel-width 6400000 6400000
<<!snip>
Router#show run | sec cable upstream controller-profile 3
cable upstream controller-profile 3
description Cox-upstream-prof-eg
us-channel 0 chan-class-id 7
us-channel 0 channel-width 6400000 6400000
us-channel 0 docsis-mode atdma
us-channel 0 equalization-coefficient
<<!snip>
Router#show run | sec node1
cable rpd node1
description TB17-RPD2-3 HWaddr F4:DB:E6:FE:CC:E2
identifier aaaa.bbbb.cccc
core-interface Hu9/1/8
principal
rpd-ds 0 downstream-cable 9/0/4 profile 25
rpd-us 0 upstream-cable 9/0/4 profile 3
rpd-us 1 upstream-cable 9/0/5 profile 3
r-dti 1
rpd-event profile 0
rpd-55d1-us-event profile 0
Sample CLI Configuration with TLV 98.3 for 0dBmV/6.4MHz
The following table shows examples of setting up the CLI to configure total absolute power level of 0dBmV/6.4Mhz (current
Cisco implementation) using the new CLI for base power config and corresponding TLV 98.3 sent to RPD. The first row in the
table above refer to CMTS and RPHY release versions which support TLV 98.3 and the older versions refer to releases which
do not have TLV 98.3 support. The example above shows the configuration for the current implementation of 0dBmV/6.4MHz for a 1.6-MHz channel. This shows how the configured TLV values on the CLI is interpreted and sent to RPD which supports TLV 98.3 for different
versions of CBR8.
Table 4.
|
Cisco IOS XE Version
|
CLI configuration on cBR-8
|
TLV 98.3 and TLV 65.9 sent to RPD
|
Description
|
|
Cisco IOS XE Cupertino 17.9.1w and later
|
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#base-power-rx-level-1_6Mhz -6
router(config-controller-profile)#us-channel 0 channel-width 1600000 1600000
router(config-controller-profile)#us-channel 0 power-level 0
|
TLV 98.3 -> -60
TLV 65.9 -> 0
|
The base power value of -6 dbmV per 1.6Mhz translates to 0 dbmV per 6.4Mhz and the channel power adjusts are true power adjusts
now. This config on BOTH RPD and CBR8 are aligned with cable lab spec power level definition.
|
|
Releases before Cisco IOS XE Cupertino 17.9.1w
|
router(config)#cable upstream controller-profile 499
router(config-controller-profile)#us-channel 0 channel-width 1600000 1600000
router(config-controller-profile)#us-channel 0 power-level 0
|
TLV 65.9 -> 0
|
This Cisco IOS XE version does not support TLV 98.3, so cBR-8 and Cisco rpd config are aligned with current legacy implementation.
|
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