User's Manual

5. Installing the Remote Link
EAC-2100 Manual: (Draft, 02/01) Page 6-10
MOBILE SYNC LOST – This indicates that sync was lost with the mobile after having
had sync. This will occur if the subscriber unit travels away from the EAC coverage
area towards an area that is not covered by the donor or any of its neighbors.
DONOR SYNC LOST – This indicates that sync was lost with the donor after having
had sync.
UNSUCSSFUL SETUP WITH DONOR – This reason is listed if the initial IS136 call
setup negotiation fails on the EAC to donor link. The exact events that must take place
vary according to if the call is mobile originated, mobile answered, or handed in to the
EAC. If this occurs frequently, the Distance from Donor parameter may be set
improperly, or there may be a weak link back to the donor.
UNSUCCESSFUL SETUP WITH MOBILE – This reason is listed if the initial IS136
call setup negotiation fails on the EAC to portable link. For mobile originated or mobile
answered calls, this indicates a problem. For RSSI>Threshold setups (i.e. where the
EAC attempts to handin a call already in progress with the donor), this reason indicates
merely that the handin was unsuccessful.
DONOR INITIATED HANDOFF – This reason is listed if the donor issues a handoff
message. Most often, this means that the subscriber moved towards a cell adjacent to
the donor and that the call was handed off normally. However, if there seems to be
many of these relative to the total number of calls (i.e. >10%) check to make sure that
the handoffs are not to other channels in the donor cell. Some cellular systems perform
an interference check algorithm. The signal level from the EAC may look like it has
interference, because the signal will not fit the signal strength versus signal quality
profile that the donor usually sees from portables. This situation usually occurs when
the link between the donor and the EAC is very good, such that the signal level from the
EAC at the donor is high. The problem is easily resolved by merely lowering the
reverse transmit level of the EAC, either by adjusting the REVERSE PA POWER OUT
– DTC setting or by installing pads in the EAC.
EAC INITIATED HANDOFF – This reason is listed if the EAC issues a handoff
message to the subscriber unit. In this case, the handoff will always be back to the
donor, and the handoff message will always take (unlike the handin case) since the
mobile it communicating on the boosted channel with the EAC.
6.10 SSS and RSS command support for DTC operation
Reverse RSSI readings for 3 slot-pairs will be shown in the SSS command output and
also in the RSS command output. Note that, while running the RSS command, you
may hit “D” for the donor RSSI line or “M” for the mobile RSSI line. Also, the
numbers 1-6 will display the mobile RSSI’s for slots 1 through 6.
6.11 SSR command support for DTC operation