Local Loop |
| After the 511/511E pattern times out, the ER led | Remote Digital | The Remote Loop uses the EOC channel (an | ||||
with 511/511E |
| will begin flashing. It will remain this way until | Loop | |||||
(continued) |
| the pattern generator switch is turned off. Note |
| remote link. Upon the RDL switch being thrown | ||||
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| that the data at the local DTE and the remote |
| or DTE initiation, a RDL_ON Request signal is | ||||
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| DTE are not valid. Because the data is unframed |
| sent to the remote unit. The Remote unit then | ||||
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| there is no way for the framer to send this data |
| responds with an RDL Acknowledge command | ||||
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| out to the DTE. This is an important distinction |
| and the link is established. Data originates at the | ||||
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| because other Patton units will send out the 511 |
| local DTE and is looped at the Remote | ||||
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| pattern. |
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| PROCESSOR back to the Local DTE. Note that |
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| When the unit is placed into a Mode 2 Local |
| the data is also passed through to the Remote | ||||
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| DTE and is not squelched. When a Remote unit | |||||
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| Loop, the 511/511E pattern generator on the |
| enters RDL, it changes its' Restart timeout to | ||||
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| local unit is unavailable for transmission. As can |
| one minute (the reason will be explain in the | ||||
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| be seen from Figure 11, the 511/511E pattern |
| RDL with 511/511E section). If the line is discon- | ||||
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| generator has no data path connections avail- |
| nected, the local unit will Restart (NS led activat- | ||||
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| able. The 511/511E pattern generator is still |
| ed) after 4 - 6 seconds, but the Remote unit will | ||||
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| available on the remote unit. For more informa- |
| wait for one minute before it Restarts. Note that | ||||
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| tion on the proper operation of this pattern gen- |
| the transmit data at the Remote DTE is ignored. | ||||
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| erator please refer to the "Remote Digital Loop |
| When the switch is thrown or the DTE removes | ||||
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| with 511/511E" section. |
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| the RDL request, the local unit will transmit an | ||
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| RDL_OFF Request to the Remote unit. The |
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| local unit will keep its' TM led active until this |
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| request has been completely sent out. If the |
Framer | Pattern | Loop | Line | Loop | Pattern | Framer |
| switch is thrown again before the completion of |
| Gen/Det | Control | Control | Gen/Det |
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| the termination phase the switch will be ignored | |
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| until it is placed back into the normal position. |
| Processor |
| Processor |
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Figure 10. Block Diagram Local Loop Mode 1 with 511/511E
Framer |
| Pattern |
| Loop |
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| Loop |
| Pattern |
| Framer |
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| Line |
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| Gen/Det |
| Control |
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| Control |
| Gen/Det |
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Framer | Pattern | Loop | Line | Loop | Pattern | Framer | Processor | Processor |
| Gen/Det | Control | Control | Gen/Det |
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Figure 12. Block Diagram Remote Loop
Processor
Processor
Figure 11. Block Diagram Local Loop Mode 2 with 511/511E
27 | 28 |
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