Cisco Systems 6200 User Manual

CHAPTER

Hardware Description

This chapter provides an overview of the Cisco 6200 advanced digital subscriber line access
multiplexer(DSLAM) and describes the system’s hardware components. The chapter is arranged as
follows:

• Cisco DSL Product Family on page 1-1

• Cisco 6200 Chassis on page 1-2

• Network Trunk Cards (NTCs) on page 1-9

• Management Processor Card (MPC) on page 1-18

1

• Subscriber Line Card (SLC) on page 1-22

Warning For translations of the safety warnings in this chapter, see Appendix C, “Translated Safety

Warnings.”

1.1 Cisco DSL Product Family

The Cisco 6200 is part of a family of digital subscriber line (DSL) products that provide end-to-end
service, carrying data between the subscriber’shomeoroffice,thetelephonecentraloffice(CO),and
the networks beyond. The Cisco 6000 family includes the following members:

• The Cisco 6200 DSLAM is a CO-grade multiplexer that supports up to 80 asymmetric digital

subscriber line (ADSL) ports. The Cisco 6200 sends and receives subscriber data (often Internet
service) over existing copper telephone lines, concentrating all traffic onto a single high-speed
trunk for transport to the Internet or the enterprise intranet.

• ADSL customer premises equipment (CPE) devices, which reside at the subscriber site

connected to PCs or routers, modulate data so that it can travel over telephone lines to the Cisco
6200 DSLAM at the CO. CPE devices in the Cisco DSL product family include the Cisco 675
and the Cisco 605.

• The Cisco 6200 Manager is an SNMP-based element management application that provides

configuration, monitoring, and management support. The Cisco6200 Manager offers a graphical
user interface and runs under Windows NT 4.0 and higher. A separate console interface to the
Cisco 6200 DSLAM provides command line access to all management services.

• ADSL plain old telephone service (POTS)splitters,orvoicefilters,located both at the subscriber

premises and at the CO, support simultaneous voice and data transmission. (If a subscriber is
using a telephone line for data only, the POTS splitter connection is not required.)

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The Cisco DSL family also includes a Frame Relay IDSL multiplexer,a service selection gateway,
the Cisco 605 card, the Cisco 6100 DSLAM, and an ATM switch to aggregate Cisco 6200 traffic.

1.2 Cisco 6200 Chassis

This section describes the chassis that houses the Cisco 6200 DSLAM.
The Cisco 6200 consists of circuitry and connections that reside within a shelf or chassis that allows

modular insertion and removalof the various field-replaceable units (FRUs).The chassis consists of
a module compartment, a fan compartment, a power module compartment, a backplane, and I/O
cabling. Figure 1-1 shows the front of the chassis; Figure 1-2 shows the back.

1.2.1 Module Compartment

The module compartment holds all circuitry that relates to Cisco 6200 operation. The module
compartment includes 14 slots that hold the modules (cards):

• Slot 1: Holds the network trunk card (NTC).

• Slot 2: Holds the management processor card (MPC).

• Slots 3 and 4: Unoccupied in this release of the system.

• Slots 5 to 14: Hold up to ten subscriber line cards (SLCs).

All Cisco 6200 cards can be installed and removed while the rest of the system continues to operate.
(However, the system cannot pass data if the NTC is removed.) The NTC, MPC, and SLCs are
described later in this chapter.

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Figure 1-1 Cisco 6200 Chassis, Front View

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1.2.2 Backplane

Located behind the module compartment, the backplane provides the following services:

• Interconnects the MPC, NTC, and SLCs

• Connects the SLCs with the subscribers (local loops) or the POTS splitter

• Distributes power, clocking, and other common signals to all the modules

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Figure 1-2 Cisco 6200 Chassis, Rear View

Dangler cables

Auxiliary port

connector

for subscriber
traffic

Alarm relay
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Primary (A) and Secondary (B) H-Buses

The backplane’s primary and secondary H-buses (horizontal buses) link the MPC, NTC, and SLCs.
In this release, the primary bus carries all traffic. The buses operate at 160 Mbps total throughput.

Each H-bus has two parts:

• A downstream component broadcasts all cells received from the NTC interface to each SLC.

(Logic on the SLC filters and directs cells destined for each port.)

• An upstream component provides a contention mechanism for cells received from subscriber

ports to be funneled into the upstream NTC path.

Ethernet Management Bus

A 10Base2-type Ethernet bus in the backplane carries internal management trafficbetween thecards.

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Connections to POTS Splitters or Telephone Lines

On the inner surface of the backplane, the upper and lower SLC connectors connect the SLC in the
corresponding slot (5 to 14) with unshielded twisted pair (UTP) lines. These lines connect to an
external POTS splitter, and from there to subscribers over telephone lines. (If a subscriber is using a
telephone line for data only, the POTS splitter is not required.)

Ten factory-installed dangler cables provide DSL subscriber connections. Each dangler cable ends
with a 50-pin female Champ Telco connector (Figure 1-3), and each carries eight pairs to a single
SLC module. For a pinout list and an illustration showing the connectors on the rear panel, see
Appendix A, “Pin Assignments.”

Figure 1-3 Telco Champ Connector

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Alarm Relay Connection

Backplane connector J39, accessible from the rear of the chassis, is the alarm relay connector. The
alarm relays provide relay contact closures. The alarm relays transmit critical, major, and minor
alarmstoaseparate,externalalarmdevicewithin the CO. The alarm device uses a bell, light, or other
signal to alert CO support personnel of the change in status. (The alarm relay transmits audible and
visual alarms on separate circuits.) Alarms transmitted through J39 are also communicated by all of
the following methods:

• Alarm LEDs (labeled Critical, Major, and Minor) on the MPC. (Some alarms also affect the TD

and RD LEDs on the NTC.)

• Event messages on the console.

• Component status display of the Cisco 6200 Manager.

To turn off an audible alarm, do one of the following:

• Press the alarm cut-off (ACO) button on the MPC

• Click the ACO button in the Cisco 6200 Manager component status display

• Use the alarmcutoff command (at the console or via Telnet)

• Use a switch or command on your external alarm device

Cutting off an alarm has no effect on the alarm status of the system or on the indication of visual
alarms. Toclear analarm, you must correct thecondition that caused it. Toget information about the
source of an alarm, do one of the following:

• Use the Cisco 6200 Manager. (See the User Guide for the Cisco 6200 Manager for instructions.)

• Use the command show dsl alarms. (See Chapter7,“Troubleshooting,”formoreinformation on

this command.)

For a pinout list and additional information on connecting alarm relays, see Appendix A, “Pin
Assignments.”

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Auxiliary Port

J40, a 9-pin female connector on the Cisco 6200 backplane, is an EIA/TIA-232 (RS-232) serial port
connecting to the management processor card (MPC). J40 is an auxiliary craft port that can be used
toconnect devicessuchasterminals,modems,orlaptopcomputerstothe Cisco 6200. It is accessible
from the rear of the chassis. For a pinout list, see Appendix A, “Pin Assignments.”

Power Terminals

J17, J18, J19, and J20, located at the upper right corner of the rear panel, are screw terminals for
–48 VDC power input and return:

• J17 is the –48V terminal for power circuit A.

• J19 is the +48V (return) terminal for power circuit A.

• J18 is the –48V terminal for power circuit B.

• J20 is the +48V (return) terminal for power circuit B.

Power circuit A is connected to the power entry module (PEM) on the left (as you face the front of
the chassis); power circuit B is connected to the PEM on the right.

Unused Connectors

The Cisco 6200 backplane contains several connectors and a jumper that are not used in the current
release. See Appendix A, “Pin Assignments,” for a list of the unused items.

1.2.3 Fan Tray

Thefantray,locatedatthebottom of the chassis, houses eight fansthatmaintain proper temperatures
inside the chassis, plus an air filter. The filter should be removed and cleaned periodically. Refer to
Chapter 6, “Preventive Maintenance,” for complete information on cleaning the air filter.

Caution The Cisco 6200 cooling fans must run continuously. The system may suffer thermal damage if the

fans stop for more than 10 minutes. (At ambient temperatures above 104 F(40 C),thermal damage may occur
sooner.)

1.2.4 Power Entry Modules (PEMs)

One or two PEMs distribute DC power to the chassis. The Cisco 6200 needs only one active PEM
to operate; if two PEMs are installed, the second PEM’s power source serves as a hot backup to the
first PEM’s power source.

Each PEM is connected to a single DC power source. For power redundancy, two PEMs must be
installed, and two separate DC powersources must be connected to the chassis. If one power source
is connected, only one PEM is required. There is no benefit to connecting two power sources to a
chassis with one PEM, or to installing two PEMs in a chassis with one power source.

The PEMs reside at the top of the Cisco 6200 chassis, and they are installed and accessed from the
front. DC power (–48V) enters the chassis through screw terminals on the rear panel of the chassis.
The PEMs receive power through the backplane and internal cabling.

The powerbayon the left is wired to power circuit A; the bay on the rightiswiredto powercircuit B.
(The circuits are identified at the power terminals on the backplane.)

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The following fixtures are present on the front panel of each PEM:

• A green LED that comes on to indicate that –48 VDC power is available to the chassis

• A circuit breaker

Note To turn off a Cisco 6200 that has two PEMs, you must flip the circuit breakers on both

PEMs to OFF (0).

1.2.5 Cooling Vents

The cooling vents are located on the sides, front, and back of the Cisco 6200 chassis, as shown in
Figure 1-4. Air flows in at the bottom of the chassis, and flows out at the top. Do not obstruct the
intake and exhaust vents in any way.

Figure 1-4 Air Flow Through Intake and Exhaust Vents

1.2.6 DSLAM Specifications

Table 1-1 lists the specifications of the Cisco 6200 DSLAM. Table 1-2 lists standards and
certifications for the Cisco 6200 DSLAM.

Warning To prevent a Cisco 6200 system from overheating, do not operate it in an area that exceeds the

maximum recommended ambient temperature of 131˚F (55˚C).

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Table 1-1 Cisco 6200 DSLAM Specifications
Specification Description

Components 14-slot card compartment

Backplane
Fan compartment
Power module compartment

Power input Dual inputs, each –48 VDC

Tested voltages: –48V and –57V
Tolerance limits: –42V to –57V
Maximum input current: 23A

1

Power consumption, fully loaded

Dimensions Height: 23.6 in. (60.0 cm)

Weight with no cards
Weight fully loaded

2

1

Operating temperatures Short term: 23 to 131 F (–5 to 55 C)

Storage temperature –40 to 158 F (–40 to 70 C)
Operating humidity 15% to 90% noncondensing
Storage humidity 10% to 95% noncondensing

1 A fully loaded chassis has 1 fan tray, 2 PEMs, 1 MPC, 1 NTC, 10 SLCs, covers, and dangler cables.
2 A chassis with no cards has 1 fan tray, 2 power entry modules, covers, and dangler cables.
3 The chassis can operate safely at short term operating temperatures only if all of the fans are working properly. If a fan fails

in a chassis that is experiencing an ambient temperature above 104 F (40 C), thermal damage may occur.

With SLC 8CAPs: 820W
With SLC 8DMTs: 892W

Width: 17.5 in. (44.4 cm) (mounting brackets not included)
Depth: 11.8 in. (30.0 cm)

48 lb (21.7 kg)

82.5 lb (37.4 kg)

3

Long term: 32 to 104 F (0 to 40 C)

Table 1-2 Standards and Certifications
Category Description

NEBS Bellcore SR-3580 to Level 3 (GR-63, GR-1089)
EMI FCC Part 68 and part 15 Class A

CSA Class A
EN55022 Class A
AS/NRZ 3548 Class A
VCCI Class 1

Safety UL 1950

EN60950
CSA C22.2 No. 950
AUSTEL TS001
AS/NZS 3260

Immunity EN61000-4-2/IEC-1000-4-2

EN61000-4-3/IEC-1000-4-3
EN61000-4-4/IEC-1000-4-4
EN61000-4-5/IEC-1000-4-5
EN61000-4-6/IEC-1000-4-6
EN61000-4-11/IEC-1000-4-11

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1.3 Network Trunk Cards (NTCs)

This section describes the OC-3c andSTM-1 network trunk cards (NTCs). The NTCmodule resides
in slot 1 of the Cisco 6200 chassis.

1.3.1 What is the NTC OC-3?

The NTC is a service interface module that concentrates the data traffic from all Cisco 6200
subscriber ports and connects the node to a single trunk line from the service-providing ATM
network. This full-duplex channel unit carries data both downstream (to the subscriber) and
upstream (from the subscriber).

In Release 1, the trunk is a full-duplex OC-3c fiber optic channel. One OC-3c channel terminates at
a single NTC.

The OC3 NTC is available in both single-mode and multimode versions. Multimode fiber is
LED-driven and is designed for distances up to 2 kilometers (1.2 miles). Longer distances (up to
15 kilometers or 9.2 miles) require laser-driven single-mode fiber.

In the downstreamdirection, the OC3 NTC accepts ATMcells at the OC-3c rate (155.52 Mbps) and
adapts these cells to the Cisco 6200 internal bus.

The OC3 NTC also transmits upstream data back to the service provider via ATM on the OC-3c
physical layer.

The Cisco 6200 uses a fixed mapping of permanent virtual channels (PVCs) between trunk and
subscriber ports. This means that no configuration of thesecircuitsisrequired. Thirty-one PVCs link
each subscriber port to the trunk port on the NTC. These subscriber traffic PVCs are assigned virtual
channel identifiers (VCIs) 33 through 63. VCIs 0 through 31 are reserved for control traffic. All of
these VCs use virtual path identifier(VPI) 0. See the chapter “Command Reference” for instructions
on using the command show dsl vcmap to display the VCIs assigned to a particular slot or port.

The OC3 NTC collects ATM cell counts, which are accessible through the 6200 Management
Information Base (MIB). These cell count include:

• Number of nonidle cells transmitted upstream

• Number of nonidle downstream cells received with good or correctable header checksums

• Number of downstream cells received with uncorrectable header checksums

The OC3 NTC provides bidirectional adaptation between serial ATM cells within the OC-3c fiber
and the 16-bit-parallel format on the backplane’s 160-Mbps H-bus. Three basic circuitsperform this
adaptation process:

• Optical interface

• Upstream data transfer

• Downstream data transfer

Figure 1-5 shows how the three circuits interact.

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Figure 1-5 NTC OC-3 Application

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The optical interface performs the optical-to-electrical and electrical-to-optical conversions. Its
other tasks include clock recovery,overheadprocessing, celldelineation,anddiagnosticinformation
retrieval.

The upstream data transfer unit receives data via a 16-bit parallel input from the internal bus on the
node’s backplane. ATM cells are received from an SLC channel only after that channel has won
access to the upstream data bus from the other contending line channels. The upstream data transfer
unit monitors the contention bus to direct inbound data to the optical interface.

The downstream data transfer unit inserts data onto the bus. This circuit inserts idle cells when a full
data cell is not yet ready for transmission.

1.3.2 NTC OC-3: Physical Description

The NTC resides in slot 1 (the left-most slot as you face the front of the chassis). Each OC-3 NTC
faceplate is marked NTC OC3-SM (single-mode) or NTC OC3-MM (multimode). The faceplate
(see Figure 1-6) includes the fixtures discussed in the following paragraphs.

OC-3c Trunk Port

The dual SC connectors (one for transmitting, one for receiving) for the Cisco 6200 network trunk
port are recessed into the OC-3 NTC faceplate to prevent the cables from protruding too far outside
the faceplate.

Warning Class 1 laser product.

Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is

connected, avoid exposure to laser radiation and do not stare into open apertures.

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