| TOTAL ACCESS | ® | 1000 239 HRE | JOBAID |
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| 0212 |
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239 HRE | LED STATUS |
| LOOPBACK AND CONTROL CODES |
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| CLEI:1179513L1VAR FC0B_ _ | |
| 239HRENE | |
| 2 | T |
22A# | LP21 | C |
UST | ||
- | LL | RL |
(Y) | (G) | |
#61179513L1 |
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NETWORK |
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LP1 / LP2 | ● OFF | No synchronization with the ICOT. |
| ● GREEN | Synchronized with good signal quality on NET Loop 1/Loop 2 |
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| (> 2 dB margin). |
| ● YELLOW | Synchronized with marginal signal quality on NET Loop 1/Loop 2 |
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| (1 to 2 dB margin). |
| ● RED | Synchronized with poor signal quality on NET Loop 1/Loop 2 |
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| (0 dB margin). |
CUSTOMER |
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LP1 / LP2 | ● OFF | No synchronization with the RT. |
| ● GREEN | Synchronized with good signal quality on CUST Loop 1/Loop 2 |
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| (> 2 dB margin). |
| ● YELLOW | Synchronized with marginal signal quality on CUST Loop 1/Loop 2 |
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| (1 to 2 dB margin). |
| ● RED | Synchronized with poor signal quality on CUST Loop 1/Loop 2 |
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| (0 dB margin). |
LL / RL | ● OFF | No active arming or loopback is detected at the HRE. |
| ● YELLOW | Indicates LB from HRE toward the network is active. |
| ● GREEN | Indicates LB from HRE toward the customer is active. |
■Cable pairs must be nonloaded
■No single Bridged Tap > 2 kft
■Maximum loop resistance is 800 Ω
■Pulse attenuation (LOSS on HDSL Current System Status screen) < 30 dB
■Impulse noise < 50 dBrn as measured using a 50 kb filter
■Total Bridged Tap < 2.5 kft
■196 KHz insertion loss < 35 dB
■Signal quality of 6 dB or higher, with no fluctuation and equal on both loops
■Wideband Noise < 31 dBrn as measured using a 50 kb filter
■Internal Clock Accuracy +25 ppm (exceeds Stratum 4)
FUNCTION | CODE | RESPONSE |
ARM | 11000 (binary) | ICOT and HRE(s) will arm and the HLIU will loop up toward the network. |
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ARM (ESF Data Link) | FF48 (hex) or 1111 1111 |
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| 0100 1000 (binary) sent | ICOT and HRE(s) will arm and the HLIU will loop up toward the network. |
| in the Facility Data Link |
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Disarm | 11100 (binary) | All units are removed from the armed state and loopbacks will be released. |
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Disarm (ESF Data Link) | FF24 (hex) or 1111 1111 |
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| 0010 0100 (binary) sent in All units are removed from the armed state and loopbacks will be released. | |
| the Facility Data Link |
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Activation ICOT1 | D3D3 (hex) or | If received while in an armed state, the ICOT will loop toward the network. |
| 1101 0011 1101 0011 |
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Loop down w/out | 9393 (hex) or | Automatically releases without disarming any ICOT and HRE that may be in |
disarming2 | 1001 0011 1001 0011 (binary) loopback toward the network. | |
HRE Network Loop up1 | C741 | If an HRE is present and units armed, the HRE will loop up toward network.. |
| (1100 0111 0100 0001) |
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HLIU Loop up1 | C742 | If received while in an armed state, the HLIU will loop toward the network.. |
| (1100 0111 0100 0010) |
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1Units must be armed with 11000b or FF48h before this code will work.
2In order to behave like an NIU, the HLIU will not loop down from the network side with 9393h.
NOTE: All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.
Card Edge Pin AssignmentPin | Designation | Description |
1 | GND | Ground |
2 | NC | No Connect |
3T1 Customer Loop 1 Tip
4R1 Customer Loop 1 Ring
5T1 Network Loop 1 Tip
6R1 Network Loop 1 Ring
7 | NC | No Connect |
8T Network Loop 2 Tip
9R Network Loop 2 Ring
10 GNDGround
11T Customer Loop 2 Tip
12R Customer Loop 2 Ring
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
■ For a complete Installation and Maintenance Practice (P/N