East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer, Руководство по эксплуатации, Страница: 55 / 77

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4.7.3.7 Channel Failover Mode [7]
The Channel Failover Mode determines the priority a channel has under conditions where a
composite link has failed and channels are re-assigned to the backup link. Low Priority and
Fixed Low channels on a non-failed link may be “bumped”, or suspended from service when
a High Priority channel is re-allocated from a failed link. Any channel that is in “fixed” mode
(Options 3 & 4), will not move to a surviving link should it‟s home link fail.
Channels are bumped only when there is not enough available bandwidth on a surviving link
to support channels that are re-allocated from a failed link. Channels are searched in
ascending order, from 1 to 16, for both bumping and re-allocation until all channels seeking
backup on the surviving link are re-allocated, or the link bandwidth is exhausted.
Option [1] - HI Priority (not bumpable, will seek backup)
Option [2] - Low Priority (bumpable, will seek backup)
Option [3] - Fixed High (not bumpable, will not seek backup)
Option [4] - Fixed Low (bumpable, will not seek backup)
4.7.3.8 Channel Failover Rate [8]
The selections in this menu allow for setting a new channel rate should the channel be re-
allocated to a surviving link as a result of a failure of it‟s home link.
The available options are:
(See section 4.7.3.2 for rates)
4.7.3.9 Channel Restoral Timer [9]
Selection of this option controls when a channel that has been re-allocated to a surviving link
is restored to it‟s home composite link after that link has been returned to service (subject to
the Composite Link Restore Holdoff Timer). A selection of “Manual” (Option 1) means that the
channel will remain active on the backup link and not be restored on it‟s home link until the
operator un-suspends it via the Channel State menu, Option 1.
The available options are:
Option [1] - Manual
Option [2] - Immediate
Option [3] - 5 seconds
Option [4] - 10 seconds
Option [5] - 20 seconds
Option [6] - 30 seconds
Option [7] - 60 seconds
Option [8] - 5 minutes
Option [9] - 15 minutes
Option [10] - 30 minutes
Option [11] - 1 hour
4.7.3.10 Channel Loop Modes [10]
The options of this menu control individual loop modes of the channel port.
[1] - Loops Off
[2] - Local Loopback
Selecting this option causes transmit data from the attached DTE to be looped back to the