Cisco Systems 6200 appendix Statistics, SLC 8CAP Operation

Page 23

78-5296-02 10/02/98

Hardware Description 1

In the downstream direction, 11 rates are available ranging from 640 kbps to 7.168 Mbps. In the upstream direction, 9 rates are available, ranging from 91 kbps to 1.088 Mbps.

The modems on the CAP SLC train in sequence, ﬁrst downstream, then upstream. Each modem ﬁrst acquires the line. Then it tests the signal quality on the line by measuring the signal-to-noise ratio (SNR). It adds a preset margin, 6 dbm, to the SNR, and compares the resulting value to a table. If the value is acceptable, the modem trains at the conﬁgured rate. If not, the modem repeats the process, using the next lower transmission rate. The modem keeps trying to train indeﬁnitely until it is successful.

Statistics

The SLC gathers signal quality statistics for network management purposes. It sends this information to the management system via the master SNMP agent. The SLC reports each of the following statistics to the management system for both upstream and downstream trafﬁc:

•

•

•

Number of nonidle cells transmitted downstream

Number of nonidle upstream cells received with valid header checksum

Number of upstream cells received with invalid header checksum

•Number of errored seconds (this is the number of seconds in which at least one header checksum error or loss of cell delineation is observed), both upstream and downstream

Figure 1-10 SLC 8CAP Operation

Cell filter

Contention

and

arbitration

ATM NTC

Cisco

6200

Public

telephone

network

SLC

Port 1

POTS

CAPsplitter transceiver

POTS splitter

Port 2

Port 3

Port 8

ADSL

modem

12690

Cisco 6200 User Guide

1-23

Image 23

Contents Cisco DSL Product Family Hardware DescriptionModule Compartment Cisco 6200 ChassisCisco 6200 Chassis, Front View BackplaneCisco 6200 Chassis, Rear View Primary a and Secondary B H-BusesEthernet Management Bus Connections to Pots Splitters or Telephone Lines Alarm Relay ConnectionFan Tray Power Entry Modules PEMsPower Terminals Unused ConnectorsDslam Speciﬁcations Cooling VentsCategory Description Cisco 6200 Dslam SpeciﬁcationsSpeciﬁcation Description Standards and CertiﬁcationsNetwork Trunk Cards NTCs What is the NTC OC-3?OC-3c Trunk Port NTC OC-3 Physical DescriptionNTC OC-3 Faceplates Reset SwitchLED Indicators Describes the LEDs on the faceplate of the OC-3 NTCColor Condition Indicated LEDs on the NTC OC-3NTC OC-3 Speciﬁcations What is the NTC STM-1?NTC OC-3 Speciﬁcations Lists the physical and electrical speciﬁcations of the NTCNTC STM-1 Application Trunk Port NTC STM-1 Physical DescriptionNTC STM-1 Faceplates Describes the LEDs on the faceplate of the NTC STM-1LEDs on the NTC STM-1 NTC STM-1 SpeciﬁcationsNTC STM-1 Speciﬁcations Management Processor Card MPCFunctional Description Cisco 6200 is controlled and managed by the MPCMPC Faceplate ACO SwitchPhysical Description All LEDs on the MPC are described in Table Console PortPcmcia Slots and Ejection Buttons Ethernet PortMPC Speciﬁcations MPC SpeciﬁcationsLists the physical and electrical speciﬁcations of the MPC Transmission Rates and Modem Training What is the SLC 8CAP?Subscriber Line Card SLC How the SLC Handles Trafﬁc10 SLC 8CAP Operation StatisticsSLC 8CAP Faceplate SLC 8CAP Physical DescriptionDescribes the LEDs on the faceplate of the SLC SLC 8CAP LEDs SLC 8CAP Speciﬁcations SLC 8CAP SpeciﬁcationsHow the SLC 8DMT Handles Trafﬁc What is the SLC 8DMT?Two modes are available for setting transmission rates SLC 8DMT Physical Description SLC 8DMT Faceplate 11 describes the LEDs on the faceplate of the SLCSLC 8DMT LEDs SLC 8DMT Speciﬁcations SLC 8DMT Speciﬁcations