DS1/DS2

OFF

No sync. Call your carrier.

Red

Poor signal quality. Call your carrier.

Yellow

Marginal signal quality. Call your carrier.

RED- Flashing

Error detected on HTU-C or HTU-R Call your carrier.

DS1

OFF

Premise equipment T1 signal not present or wrong format. Call your vendor.

RED- Flashing

Premise equipment T1 signal errors. Call your vendor.

ALM

Red

Local alarm at HTU-R card detected.

Yellow

Remote alarm at HTU-C card detected.

ESF/SF

OFF

Unframed mode. Call your carrier.

Yellow

ESF framing

Green

SF framing

B8ZS/AMI

Yellow

B8ZS

Green

AMI

LBK

Yellow

Active local loop back at th HTU-R