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Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
OL-10705-02
Chapter 2 Cisco Cable Wideband Components
Wideband CMTS Components
The NSG 9000 provides scalable support up to 72 QAM RF outputs. The chassis is fitted with a passive
backplane, while all the processing and modulation functions are performed on retrievable modules. The
chassis has nine QAM RF module slots. Each hot-swappable QAM module has two RF ports, and each
port is capable of supporting up to 4 adjacent QAM channels (3 channels in Annex A).
Figure 2-11
Harmonic NSG 9000 Edge QAM Device
The NSG 9000 is housed in a 2-RU chassis. The system can host two load-sharing AC or DC power
supplies, which can be redundant to each other. More detailed information on the NSG 9000 is available
at:
http://www.harmonicinc.com/stageone/files/harmonic/collateral/NSG9000%5Fv07%2D02%5FRS%2E
pdf
Vecima Networks VistaLynx VL1000
Vecima Networks VistaLynx VL1000 is one of the edge QAM devices that has been tested for
interoperability with other solution components. The VistaLynx VL1000 has two redundant Gigabit
Ethernet input interfaces that use small form factor (SFP) modules for fiber-optic and copper links.
The VistaLynx VL1000 QAM channels can be increased in increments of four to a maximum of 24 QAM
channels.
The chassis accepts a
minimum of two QAM cards and a maximum of six, for a total of 24
QAM channels. Each hot-swappable QAM card contains two RF ports capable of generating two QAM
channels per port.
Figure 2-12
Vecima Networks VistaLynx VL1000 Edge QAM Device
The VistaLynx VL1000 chassis is a single rack unit high. The system has two redundant AC power
supplies. More detailed information on the VistaLynx VL1000 is available at:
http://www.vecimanetworks.com/vistalynx.html
Gigabit Ethernet Switch (Optional)
A Gigabit Ethernet (GE) switch can optionally be used to link the Wideband SPAs to edge QAM devices.
The Gigabit Ethernet switch concentrates traffic from multiple GE links from the SPAs to a smaller
number of GE links prior to fiber transport to the edge QAM devices.
A Gigabit Ethernet switch is required to connect Wideband SPAs to the EQAM devices in the following
situations:
•
If more than two EQAM devices are required for two Wideband SPAs
•
If video-on-demand (VOD) traffic and the RF channels for wideband channels are mixed on the
same EQAM device
