Local Loop | After the 511/511E pattern times out, the ER led |
with 511/511E | will begin flashing. It will remain this way until |
(continued) | the pattern generator switch is turned off. Note |
| that the data at the local DTE and the remote |
| DTE are not valid. Because the data is |
| unframed there is no way for the framer to send |
| this data out to the DTE. This is an important |
| distinction because other Patton units will send |
| out the 511 pattern. |
| When the unit is placed into a Mode 2 Local |
| Loop, the 511/511E pattern generator on the |
| local unit is unavailable for transmission. As can |
| be seen from Figure 10, the 511/511E pattern |
| generator has no data path connections avail- |
| able. The 511/511E pattern generator is still |
| available on the remote unit. For more informa- |
| tion on the proper operation of this pattern gen- |
| erator please refer to the "Remote Digital Loop |
| with 511/511E" section. |
Remote Digital The Remote Loop uses the EOC channel (an
Loopout-of-band signaling channel) to establish the remote link. Upon the RDL switch being thrown or DTE initiation, a RDL_ON Request signal is sent to the remote unit. The Remote unit then responds with an RDL Acknowledge command and the link is established. Data originates at the local DTE and is looped at the Remote PROCESSOR back to the Local DTE. Note that the data is also passed through to the Remote DTE and is not squelched. When a Remote unit enters RDL, it changes its' Restart timeout to one minute (the reason will be explain in the RDL with 511/511E section). If the line is discon- nected, the local unit will Restart (NS led activat- ed) after 4 - 6 seconds, but the Remote unit will wait for one minute before it Restarts. Note that the transmit data at the Remote DTE is ignored. When the switch is thrown or the DTE removes the RDL request, the local unit will transmit an RDL_OFF Request to the Remote unit. The
Framer
Pattern | Loop | Line | |
Gen/Det | Control | ||
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Processor |
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Loop Pattern
Control Gen/Det
Processor
Framer
local unit will keep its' TM led active until this request has been completely sent out. If the switch is thrown again before the completion of the termination phase the switch will be ignored until it is placed back into the normal position.
Figure 9. Block Diagram Local Loop Mode 1 with 511/511E
Framer | Pattern | Loop | Line | Loop | Pattern | Framer |
| Gen/Det | Control | Control | Gen/Det |
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Figure 10. Block Diagram Local Loop Mode 2 with 511/511E
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Figure 11. Block Diagram Remote Loop
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