User's Manual

2. Preliminary Decisions
AMPS EAC-2100 Manual: (Draft, 02/01) Page 1-5
Model: Low Split High Split
Band: A, D & B E, F, & C
Channel Number Range: 1-1167 833-1999
Forward Frequency Range: 1930-1965 MHz 1955-1990 MHz
Reverse Frequency Range: 1850-1885 MHz 1875-1910 MHz
Note that there is some overlap between the low split and high split bands. This is due to the
characteristics of the duplexers.
Boosting DCCH Channels. The EAC-2100 monitors the PCS donor DCCH channel to obtain
system-specific information. It generates a DCCH data stream and transmits it on a different
DCCH channel that is assigned for repeater use. Subscribers that are unable to receive the
original channel then lock onto the boosted DCCH channel and communicate with the cell site
through the booster. Adding the repeated DCCH channel to the donor’s neighbor list will allow
subscribers in the repeater coverage area to lock onto the repeater and to receive or place calls.
Boosting DTC Channels. The amplifiers for repeating DTC channels are enabled as needed
when digital traffic channel (DTC) activity is detected in the repeater coverage area. The EAC-
2100 identifies subscribers in the repeater coverage area by two methods: one for identifying
subscribers that place or answer calls from within the repeater coverage area and another for
identifying subscribers that enter the area with a call in progress.
When a call is placed or answered from within the repeater coverage area, the following
sequence occurs:
1. The subscriber accesses the reverse boosted DCCH channel. The EAC-2100 receives the
access, then accesses the reverse donor DCCH channel.
2. The EAC-2100 waits for the corresponding DTC designation message on the forward
channel.
3. The EAC-2100 modifies the DTC designation message by substituting one of its boosted
DTC RF channels for the donor DTC assignment, thus sending the subscriber to one of the
boosted DTC RF channels.
4. A repeat path is set up between the subscriber and the primary donor cell site, with the
subscriber operating on the boosted DTC RF channel, the donor operating on the donor
DTC, and the EAC-2100 translating and boosting between the two.
To identify subscribers that may drive into the boosted coverage area with a call in progress, the
EAC-2100 scans the donor DTC RF channels on a per-time-slot basis and maintains a Received
Signal Strength Indicator (RSSI) average for each time-slot. If the average RSSI exceeds a
preset threshold, the EAC-2100 hands the subscriber to one of the boosted DTC channels.