Motorola SURFboard SB4101 User manual

Modem Power-on System Test (POST).

If LED remains blinking, faulty modem.

Modem scanning downstream frequencies.

Modem ranging upstream.

Downstream and Upstream acquired. Modem

processing for DHCP, TFTP, and TOD.

Modem operational. Activity light blinks

when transmitting or receiving data.

“Standby” switch enabled. Modem successfully

completed boot sequence and all LED’s

blink off, except “Standby”.

Modem powered off.

SURFboard SB4101 Cable Modem LED Status

Power on

Downstream Scan

Upstream Range

Network Connect

Network Activity

Standby

Power off

Notes:

Notes: R

483826-001-99 Rev C

OWER

ECEIVE

CTIVITY

TANDBY

END

NLINE

SB4101

SURFboard

CableModem

Power

Receive

Send

Online

Activity

Standby

SURFboard SB4101 Cable Modem

On = Off = Flashing =

J-5362-601-5K

Next 6 MHz

scan

Initialization

complete

(note E)

Yes

Modem power-on

POST

(Note A)

Complete

registration with

CMTS

SB4101

standby

switch is

enabled

Log error

and continue

Modem begins

scanning for

DOCSIS

downstream

(Note B)

Using TFTP

server and

filename from

DHCP, download

the TFTP

configuration file

Establish time of

day using server

IP provided by

DHCP

Hardware failure,

replace modem

Modem begins

ranging power

at 25 dBmV

moving up in

6 dBmV steps

to maximum of

60 dBmV

and then

drops down to

8 dBmV and

starts over.

Range is

attempted 3

times.

Did POST

pass?

Standby

LED on

(note F)

CM assigned

IP address?

Ranging

successful?

DOCSIS sync?

64 or 256 QAM?

BLP

enabled?

CM receive

config file?

Did CM get

TOD?

Using UCD

information begin

ranging power at

specified upstream

frequency

(note C)

RF link is

established.

Modem will now

issue a DHCP

broadcast

(note D)

Key

Authorization

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