0 start up and verification – Alpha Technologies AlphaNet IDH4 for XM2 and XM2-300HP Series - Technical Manual User Manual

Page 69

746-257-B2-001, Rev. B (01/2014)

9.3.1 Detailed LED Descriptions

REG - CM Registration
Once a downstream channel has been negotiated between the CM and CMTS, the modem

attempts to register with the DHCP server and obtain the configuration file. This LED flashes

while the process takes place. Once the registration is complete, the LED will remain on solid.

This is the best indication that the IDH4 Series is communicating with the CMTS in the headend.
DS - Downstream Communication
This LED indicates the state of the CM's attempt to gain a downstream signal. This process may

take several seconds, depending on how long it takes the CM to locate a carrier signal and lock

onto a channel. The LED flashes while searching for the downstream DOCSIS channel and is on

solid when the downstream channel is locked.
ACT - CPE Activity
The CPE activity LED flashes to indicate that data is being transmitted or received between the

IDH4 Series and a network device.
LNK - Network Communication Status
The Ethernet link LED remains ON when there is an active connection on the Ethernet port (e.g.,

a computer is connected for local diagnostics).
Rx/Tx Power
The Rx/Tx PWR LEDs provide the installer a quick verification of the modem transmit (Tx) and

receive (Rx) RF power levels. The Rx/Tx PWR LED will illuminate “green” when both the cable

modem Tx and cable modem Rx RF power levels are within the range as specified in the SCTE-

HMS PropertyTable. The LED indicator illuminates “blue” when Rx and/or Tx levels are within

the “warning” range as specified by the SCTE-HMS PropertyTable. The LED indicator illuminates

“red” when Rx and/or Tx levels are outside the range as specified by the SCTE-HMS Property-

Table.
Refer to the following table for default ranges in the SCTE-HMS PropertyTable:

9.0 Start Up and Verification

Parameter

alarm Enable

HiHi

LoLo

Deadband

docsIfDownChannelPower

(OID:1.3.6.1.2.1.10.127.1.1.1.1.6)

(0F*)

150

100

-100

-150

docsIfCmStatusTxPower

(OID:1.3.6.1.2.1.10.127.1.2.2.1.3)

(0C*)

550

500

* Values in ( ) denote behavior of the Rx/TX LED if alarmEnable bits are set to ‘00’.

By default, alarmEnable is set to 00 (disabled) to prevent unwanted SNMP traps but the LED

behavior will function as if the alarmEnable were set to the values in the above table. If the alarm

Enable bits are set to anything other than 00 the LEDs will then follow the behavior of the desired

enable bit setting.
The above default values translate into the following Rx/Tx Power LED color ranges:

LED Color

Rx Range (dBmV)

Tx Range (dBmV)

Green

+10 to -10

0 to +50

Blue

+15 to +10 and -10 to -15

+50 to +55

Red

>+15 and <-15

>+55