Cisco 6130 NI-1 Conversion Procedure page 10

Subtended Network Configuration Overview
A subtended network configuration supports the following features:
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The NI-2 card provides three types of subtended network connections:
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The following sections detail the three types of subtending network connections.
Subtended Network Configuration with DS3 NI-2 Cards
In a subtended network configuration using DS3 NI-2 cards, you can subtend a Cisco 6130 chassis
to four tiers, with up to twelve chassis, all connecting through one subtending host chassis to the
ATM backbone).
Figure 1 shows typical DS3-configured Cisco 6130 systems subtended in a combined subtending tree
topology with daisy chain. The subtending host chassis at the top of the subtending tree connects
directly to the ATM switch. The middle two Cisco 6130 chassis in the lowest level are daisy chained.
TRNK 1 refers to the single network trunk or Cisco 6130 chassis subtended network interface. SBTD 2
and SBTD 3 refer to the two Cisco 6130 chassis subtended interfaces. You make network interface
connections at the system I/O card that is installed on the Cisco 6130 chassis backplane.
Cisco 6130 NI-1 to NI-2 Upgrade Kit Conversion Procedures
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The capacity to run data as fast as the speed of its subtended link. Uplink speed cannot exceed the
OC-3 speed.
Four arbitration priorities, one for each quality of service (QoS) level. The supported QoS service
levels are
Constant bit rate (CBR) for rate-limited services that require guaranteed bandwidth and
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bounded delay
– Variable bit rate-real time (VBR-rt) for delay-sensitive voice and video services
Variable bit rate-non-real time (VBR-nrt) for high-priority data services
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Unspecified bit rate (UBR) for low-priority data services
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Explicit forward congestion indication (EFCI) marking for available bit rate (ABR)
service support.
Guaranteed frame rate (GFR).
Tree or daisy chain configurations for DS3 subtended Cisco 6130 chassis.
Daisy chain configurations for OC-3 subtended Cisco 6130 chassis.
Fair access to the trunk port for each subtended chassis.
A network trunk port that operates as fast as any subtended link.
A high-speed OC-3 optical ATM interface that supports single-mode fiber (SMF)
intermediate range
A high-speed OC-3 optical ATM interface that supports multimode fiber (MMF) short range
A DS3 ATM interface
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