Specifications

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Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
OL-10705-02
Chapter 4 Implementing and Configuring the Solution
Wideband CMTS Configuration
Configuring the Gigabit Ethernet Switch
A Gigabit Ethernet (GE) switch linking the Cisco Wideband SPAs and the edge QAM (EQAM) devices
is optional except when more than two EQAM devices are required for two Wideband SPAs, or when
video-on-demand (VOD) traffic and the RF channels for wideband channels are mixed on the same
EQAM device. The configuration of the Gigabit Ethernet switch is device-specific and
implementation-specific, but it is recommended that virtual LANs (VLANs) be used to create separate
broadcast domains for the traffic of each Wideband SPA.
Figure 4-1 shows an example of VLAN usage. Wideband SPA 1 uses the QAM outputs on EQAM A and
EQAM B. Wideband SPA 2 uses the QAM outputs on EQAM C and EQAM D.
• VLAN 1 carries traffic for Wideband SPA 1.
• VLAN 2 carries traffic for Wideband SPA 2.
Both the Wideband SPAs and EQAM devices have redundant Gigabit Ethernet links that are members
of the appropriate VLANs.
Figure 4-1 VLANs for Wideband Traffic
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uBR10012
CMTS
Wideband SPA 1
GE
Wideband SPA 2 GE
EQAM A
GE
EQAM B
GE
EQAM C
GE
VLAN 1
VLAN 2
VLAN 1
VLAN 2
VLAN 1