ADTRAN SHDSL T1 OPERATION Test Capabilities, Customer Port, Self Diagnostics, Bert, E1 Mode

NOTE

When the LTU is in T1 mode, all related E1 options will be non-applicable. A non-appli- cable option setting is still changeable, but will not take affect until the option become appli- cable.

5. OPERATION

Test Capabilities

The Total Access SHDSL T1/E1 LTU has the following test capabilities:

•Self diagnostics

•Local loopbacks

•EOC initiated remote loopbacks

•Internal bit error rate tester (BERT)

Self Diagnostics

The Total Access SHDSL T1/E1 LTU performs self diagnostic tests of its Read Only Memory (ROM), Random Access Memory (RAM), LEDs, and non- volatile configuration setting upon power-up.

Local and Remote Loopbacks

For troubleshooting purposes, the SHDSL T1/E1 LTU provides three types of loopback tests.

1.Dual sided

2.Network

3.Customer

BERT

The SHDSL T1/E1 LTU provides an internal bit error rate tester (BERT) for the injection and observation of random bit sequence to and from the SHDSL.

Customer Port

The SHDSL T1/E1 LTU operates in either E1 mode or T1 mode.

E1 Mode

In E1 mode the port features are as follows:

•Carries information at the rate of 2.048 Mbps

•Uses CCS framed format with or without CRC-4

•Operates in either Alternate Mark Inversion (AMI) or High-Density Bipolar 3 (HDB3) line code

•Provides programmable timeslot idle pattern

•Supports ISDN-PRA V3 service

•Displays additional status information via a local VT100 management screen

See Table 5 for E1 port statistics definitions.

T1 Mode

In T1 mode the port features are as follows:

•Carries information at the rate of 1.544 Mbps

•Uses Superframe Format (SF) or Extended Super- frame Format (ESF)

•Operates in either Alternate Mark Inversion (AMI) or Bipolar w/8-Zero Substitution (B8ZS) line code

•Provides programmable timeslot idle pattern

•Monitors the Facility Data Link (FDL)

•Displays additional status information via a local VT100 management screen

See Table 6 for T1 port statistics definitions.

NOTE

In T1 mode both the SHDSL T1/E1 LTU and the SHDSL NTU must be operational.

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