Table of Contents

Modems

2.1 Installation with a POTS Splitter

Module Slot Assignments

2.2 Installation without a POTS Splitter

2.2.1 Single DSLAM Installation
2.2.2 Multiple-DSLAM Installation

2.3 Subtended Configuration

Supported Subtending Interface Types
Supported Subtending Features

2.3.1 Subtending DS3 Configured Cisco 6130 NI-2 DSLAMs
2.3.2 Subtending OC-3 Configured Cisco 6130 NI-2 DSLAMs

Cisco 6130 NI-2 DSLAM System Configurations

This chapter describes the two primary configurations of a Cisco 6130 NI-2 DSLAM system:

• Installation with a POTS splitter---In this configuration, Cisco 6130 NI-2 DSLAM chassis universal slots contain DMT-2 quad-port ATUC-1-4DMT modules. Cisco Champ connector cables route voice and digital signals from the central office (CO) facility main distribution frame (MDF) to a POTS splitter.

Modems

Each Cisco 6130 NI-2 DSLAM quad-port ATUC-1-4DMT module contains four modems. A Cisco 6130 series NI-2 DSLAM with POTS configuration connects each quad-port ATCU-1-4DMT modem directly and physically to an individual subscriber line.

In a Cisco 6130 NI-2 DSLAM

• You can install a maximum of 32 quad-port ATUC-1-4DMT modules, yielding up to 128 DSL inputs per Cisco 6130 NI-2 multiplexer chassis.

• With POTS configuration---You must install a POTS splitter, with voice and digital data filters, at the CO facility. Cisco Champ connector cables route subscriber voice and digital data signals from the facility MDF to the POTS splitter. Cisco Champ connector cables also route voice analog signals from the POTS splitter rear panel to the CO facility Public Switched Telephone Network (PSTN).

• Without POTS configuration---A POTS splitter is not required. Cisco Champ connector cables route modem digital data signals directly to the Cisco 6130 NI-2 DSLAM backplane.

For information about rack requirements, see "Planning for a Cisco 6130 NI-2 DSLAM System."

2.1 Installation with a POTS Splitter

This section describes a Cisco 6130 NI-2 DSLAM installation with a POTS splitter, which includes the following:

• One fan tray---Required to achieve Network Equipment Building Systems (NEBS) compliance when you install a Cisco 6130 NI-2 DSLAM.

• One Cisco 6130 NI-2 DSLAM---Up to two Cisco 6130 NI-2 DSLAMs are allowed per rack.

• One Siecor POTS splitter or equivalent.

Figure 2-1 shows the components required for an installation with a Siecor POTS splitter when you use a Cisco 6130 NI-2 DSLAM. This configuration accommodates from 16 to 32 quad-port ATUC-1-4DMT DMT-2 modules and can accommodate 128 combined voice and digital data subscriber lines.

Figure 2-1: Cisco 6130 NI-2 DSLAM with Siecor POTS Splitter---Single System Installation

If you install more than one Cisco 6130 NI-2 multiplexer chassis in a rack installation with a Siecor POTS splitter (Figure 2-2), you must

• Install a fan tray below each Cisco 6130 NI-2 multiplexer chassis. Allow 1 rack unit (RU) of space between the fan tray and the POTS splitter (see Figure 2-2).

• Allow 1 RU of space between the first Siecor POTS splitter and the second Cisco 6130 NI-2 multiplexer chassis.

Module Slot Assignments

Table 2-1 and Table 2-2 describe each module slot assignment for the Cisco 6130 NI-2 DSLAM with POTS splitter configuration shown in Figure 2-1.

Table 2-1: Cisco 6130 DSLAM NI-2 Slot Assignments

Module Slot	Module Assignment
1 to 8	ATUC-1-4DMT DMT-2 modules only1
9 and 29	Blank module slot faceplate2
10	NI-2 module
11	Blank full-length module slot faceplate2
12 and 30	Blank module slot faceplates2
13 to 28	DMT-2 quad port ATUC-1-4DMT modules only1
31 to 38	DMT-2 quad-port ATUC-1-4DMT modules only1

1The DMT-2 quad-port ATUC-1-4DMT module is installed in a Cisco 6130 NI-2 multiplexer chassis module slot. 2Although not required for system operation, blank faceplates must be installed in all empty slots of each Cisco 6100 NI-2 DSLAM chassis to comply with NEBS requirements.

 

Table 2-2: PSC Slot Assignments



Module Slot
Module Assignment

 1 to 16
 Siecor POTS splitter modules only



 

2.2 Installation without a POTS Splitter

This section describes an installation without a POTS splitter, which includes the following:

• One Cisco 6130 NI-2 DSLAM---No more than two Cisco 6130 DSLAMs are allowed in a standard 7-foot rack

• One fan tray---Required to achieve NEBS compliance when you are using a Cisco 6130 NI-2 DSLAM

2.2.1 Single DSLAM Installation

In a single Cisco 6130 NI-2 DSLAM system installation without a POTS splitter

1. The CO facility MDF receives digital data only on each digital subscriber line.

2. A Cisco Champ connector cable pair conducts digital data signals from the CO facility MDF to the Cisco 6130 NI-2 DSLAM backplane in a CO facility rack.

3. A subtended Cisco 6130 NI-2 DSLAM system installation requires more than one standard rack when more than one Cisco 6130 NI-2 DSLAM is subtended.

The single Cisco 6130 NI-2 multiplexer chassis hardware configuration is similar to that shown in Figure 2-1, except that a POTS splitter is not installed. No more than two Cisco 6130 NI-2 multiplexer chassis can be installed in a single, standard 7-foot, CO facility rack.

2.2.2 Multiple-DSLAM Installation

In a multiple Cisco 6130 NI-2 DSLAM system installation without a POTS splitter

1. The CO facility MDF receives digital subscriber line data only.

2. Two pairs of Cisco Champ connector cables conduct digital data signals from the CO facility MDF to two Cisco 6130 NI-2 multiplexer chassis in a CO facility rack.

3. A fan tray must be installed below each Cisco 6130 NI-2 multiplexer chassis. You can install up to two Cisco 6130 NI-2 multiplexer chassis in a single rack. Cisco 6130 NI-2 multiplexer chassis module slot assignments in an installation without POTS is the same as that shown in Table 2-1.

The hardware configuration is similar to that shown in Figure 2-2, except that the two POTS splitters are not installed.

2.3 Subtended Configuration

In this guide, subtending refers to the host Cisco 6130 NI-2 DSLAM, and subtended refers to downstream Cisco 6130 NI-2 DSLAM chassis in a subtended network.

• Services and aggregates data from one or more Cisco 6130 NI-2 DSLAM chassis into a single host Cisco 6130 NI-2 DSLAM to take advantage of the DSL data network interface at the host (primary) 6130 NI-2 DSLAM.

• Reduces the number of ATM edge switch ports required to terminate the system DSLAMs.

• Twelve DS3 configured Cisco 6130 NI-2 DSLAMs in 4-tree levels or in a daisy chain, connected through one subtending host Cisco 6130 NI-2 multiplexer chassis, to the ATM backbone.

• Twelve OC-3 configured Cisco 6130 NI-2 DSLAMs in a daisy chain, connected through one subtending host Cisco 6130 NI-2 multiplexer chassis, to the ATM network backbone (see Figure 2-4).

Supported Subtending Interface Types

The Cisco 6130 NI-2 DSLAM supports these subtending interface types: DS3, OC-3 single mode, and OC-3 multi-mode.

Supported Subtending Features

A Cisco 6130 NI-2 DSLAM supports the following subtending features:

• The capacity to run data as fast as the speed of its subtended link. Uplink speed cannot exceed OC-3 speed.

• Four arbitration priorities, one for each quality of service (QoS) level. The QoS service levels supported are

  • Constant bit rate (CBR) for rate-limited services that require guaranteed bandwidth and 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

  • Unspecified bit rate (UBR) for low-priority data services

• Explicit forward congestion indication (EFCI) marking for available bit rate (ABR) service support.

• Guaranteed frame rate (GFR).

• Up to 12 subtended Cisco 6130 NI-2 DSLAMs with DS3 type NI-2 module hosts that feed one network trunk.

• Up to 12 subtended Cisco 6130 NI-2 DSLAMs with OC-3 type NI-2 module hosts that feed one network trunk.

• Tree or daisy chain configurations for DS3 subtended Cisco 6130 NI-2 DSLAMs.

• Daisy chain configurations for OC-3 subtended Cisco 6130 NI-2 DSLAMs.

• Fair access to the trunk port for each subtended chassis.

• A network trunk port that operates as fast as any subtended link.

2.3.1 Subtending DS3 Configured Cisco 6130 NI-2 DSLAMs

Figure 2-3 and Figure 2-4 show subtended Cisco 6130 NI-2 DSLAM networks:

• Figure 2-3 shows typical DS3 configured Cisco 6130 NI-2 DSLAMs subtended in a combined tree topology with daisy chain; the middle two DSLAMs in the lowest level are daisy chained. TRNK 1 refers to the single network trunk or Cisco 6130 NI-2 DSLAM subtended network interface. SBTD 2 and SBTD 3 refer to the two Cisco 6130 NI-2 DSLAM subtended interfaces. You make network interface connections at the system I/O card installed on the Cisco 6130 NI-2 DSLAM backplane. You can subtend a maximum of 12 DS3 type Cisco 6130 series NI-2 DSLAMs in a tree topology or in a daisy chain (see Cisco 6130 NI-2 DSLAM System I/O Card Installation and Configuration).

• Figure 2-4 shows typical OC-3 configured Cisco 6130 NI-2 DSLAMs subtended in a daisy chain.

Cisco 6130 NI-2 DSLAM Network in a Combined DS3 Tree Topology and Daisy Chain

2.3.2 Subtending OC-3 Configured Cisco 6130 NI-2 DSLAMs

Daisy chain subtending is optimal for OC-3 based network configurations. Each OC-3 type NI-2 module includes two optical interfaces:

Figure 2-4 shows a typical daisy chain for OC-3 configured Cisco 6120 NI-2 DSLAMs. You can subtend a maximum of 12 OC-3 configured Cisco 6130 NI-2 DSLAMs in a daisy chain.

Cisco 6130 NI-2 DSLAM Network Using
OC-3 Daisy Chain

Posted: Mon Mar 6 06:55:25 PST 2000
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