NOTE
When the LTU is in T1 mode, all related E1 options will be
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
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
•Operates in either Alternate Mark Inversion (AMI) or
•Provides programmable timeslot idle pattern
•Supports
•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
•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.
Issue 1, August 2003 | 5 |