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Maintenance Object Repair Procedures
555-233-123 10-1838 Issue 4 May 2002
The DS1 CIRCUIT PACK form for the TN464GP/TN2464BP circuit packs has
fields to support echo cancellation:
Echo Cancellation?
,
EC Direction
,
and
EC Configuration
. The
Echo Cancellation?
field displays only if the
Echo Cancellation feature has been activated on the System-Parameters
Customer Options form. The
EC Direction
and
EC Configuration
fields
do not display unless the user has entered
y
in the
DS1 Echo Cancellation?
field.
■
EC Direction determines the direction from which echo will be eliminated,
ether inward or outward.
■
EC Configuration is the set of parameters that will be used when cancelling
echo. This information is stored in firmware on the UDS1 circuit pack.
Echo cancellation is turned on or off on a trunk group basis using the change
trunk-group command. If the TRUNK GROUP field,
DS1 Echo
Cancellation?
is set to
y
, echo cancellation will be applied to every
TN464GP/TN2464BP trunk member in that trunk group. The echo cancellation
parameters used for a given trunk member are determined by the Echo
Cancellation Configuration Number administered on the DS1 Circuit Pack form
for that specific trunk’s board.
Echo cancellation on the TN464GP/TN2464BP is selectable per channel, even
though it is administrable on a trunk group basis. For example, if all but two ports
on a TN464GP/TN2464BP need to have echo cancellation applied, those two
ports must be put in a trunk group where the
DS1 Echo Cancellation
field is
set to
n
. The remaining ports will be in a trunk group(s) where the
DS1 Echo
Cancellation
field is set to
y
. A user will have the ability to cancel echo coming
from the network (far-end echo) or coming from the switch (near-end echo).
The TN464 UDS1 Circuit Pack
The TN464C, D, E, F, and GP Universal DS1 Interface circuit packs provide an
interface to the DS1 facility, and are designed to support 24 DS0 channels on a
1.544 Mbps DS1 link, or 32 DS0 channels on a 2.048 Mbps link. (The 32-channel
interface is not supported on G3r V1 systems.) The DS0 channels can be
administered as trunks to other switches, lines to off-premises stations, ports to
line-side PRI terminating devices, or ports to other line-side non-PRI terminating
devices. (DS0 channels on TN464/Bs can only be administered as trunks to other
switches.) For more information on how TN464 ports can be used, see the
maintenance objects (MOs): ISDN-SGR, ISDN-TRK, ISDN-LNK, PE-BCHL,
TIE-DS1, CO-DS1, DID-DS1, OPS-LINE and WAE-PT.
NOTE:
For information on other DS1 circuit packs, see DS1-BD.
NOTE:
The TN464GP provides Echo Cancellation, and in addition, the TN464GP
firmware may be updated using the firmware download feature.