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61225236L1-5A

Issue 1, August 2003

    5

5. OPERATION

Test Capabilities

The SHDSL T1/E1 NTU has the following test capabil-
ities:

• Self diagnostics
• Local loopbacks
• EOC initiated remote loopbacks
• Inband remote loopback detection (E1 mode only)
• Internal bit error rate tester (BERT)

Self Diagnostics

The SHDSL T1/E1 NTU 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 NTU 
provides three types of loopback tests. 

1. Dual sided
2. Network
3. Customer

Inband Loopback Detection

Inband remote loopback response is supported on the 
E1 port. The SHDSL T1/E1 NTU supports V.54 and 
PN127 inband signalling protocols.

BERT

The SHDSL T1/E1 NTU contains a built-in Bit Error 
Rate Test (BERT). The BERT involves injecting and 
detecting a Pseudorandom Binary Sequence (PRBS) 
toward the network on the selected payload (i.e. G.703 
or entire SHDSL payload). The PRBS used in the 
SHDSL T1/E1 NTU is PRS15 as defined in ITU-T 
0.150 and 0.151. It is also known as 

2e15 – 1

 pattern.

Customer Port

The SHDSL T1/E1 NTU 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) for loopback 

commands

• Displays additional status information via a local 

VT100 management screen

See 

Table 6

 

for T1 port statistics definitions.

Содержание 1225236L1

Страница 1: ...1 NTU is a network terminating module using Single Pair High Speed Digital Subscriber Line SHDSL technology to transport data over a single copper loop Revision History This is the initial issue of th...

Страница 2: ...ssible keep the original shipping container for returning the SHDSL T1 E1 NTU for repair or for verification of shipping damage Figure 2 Typical System Application Table 1 Compliance Codes Code Input...

Страница 3: ...ons The SHDSL T1 E1 NTU is designed for a T200 or T400 type form factor housing and inserts into the customer T1 or E1 T200 type equipment Follow local practice for installation of the SHDSL T1 E1 NTU...

Страница 4: ...The menu tree in Figure 3 illustrates the path to every provisioning performance and test access point in the SHDSL T1 E1 menu system Table 4 lists the complete set of configurable options with setti...

Страница 5: ...payload i e G 703 or entire SHDSL payload The PRBS used in the SHDSL T1 E1 NTU is PRS15 as defined in ITU T 0 150 and 0 151 It is also known as 2e15 1 pattern Customer Port The SHDSL T1 E1 NTU operat...

Страница 6: ...iolations Count CVC LOSW Seconds LOSWS Loopback Status BERT Status General Status Data Rate Framing Mode Errored Seconds ES Severely Errored Seconds SES Unavailable Seconds UAS Code Violations Count C...

Страница 7: ...1 to 15db Alarm Threshold Disabled Loop Attenuation Alarm Threshold 0 Disabled 1 to 127db Alarm Threshold Disabled ES 15 Minute Alarm Threshold 0 Disabled 1 to 900 Seconds Alarm Threshold Disabled SE...

Страница 8: ...led Table 4 Configuration Options List Continued Category Option Setting Default Table 5 E1 Port Statistics Definitions Statistic Framing Mode Definition Errored Seconds ES Unframed LOS condition or B...

Страница 9: ...Mode Definition Errored Seconds ES Unframed LOS condition or BPV s 0 SF LOS or LOF condition or if BPV s 0 or FE s 0 ESF LOS or LOF condition or if BPV s 0 or FE s 0 Severely Errored Seconds SES Unfr...

Страница 10: ...10 Issue 1 August 2003 61225236L1 5A...

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