Nortel Networks Welding System 411-2021-111 User Manual
3-1
DMS-MTX DualMode Metrocell Cell Site Description
3
Cell Site Layouts
This chapter provides information on the layout and cabling of the different
DualMode Metrocell configurations.
DualMode Metrocell configurations.
Note:
The DualMode Metrocell supports only Transmit Receive Units
(TRU) with Product Engineering Code (PEC) NTAX98AA. No other
radios can be used. The NTAX98AA TRU supports full digital and analog
transmissions in accordance with IS-54 and IS-41 standards.
radios can be used. The NTAX98AA TRU supports full digital and analog
transmissions in accordance with IS-54 and IS-41 standards.
Omni cell site configuration
The Metrocell in an omni configuration uses at least two equipment frames,
one CE Frame and one RF frame (see Figure 3-1). With only one RF frame,
the maximum number of Voice Channels (VCH) supported by the cell site is
22 since two of the 24 TRUs have to be assigned as the Control Channel
(CCH) and the Locate Channel Receiver (LCR). As traffic grows, four
additional RF frames can be added to the site to accommodate up to a
maximum of 120 channels, including the CCH and the LCR.
one CE Frame and one RF frame (see Figure 3-1). With only one RF frame,
the maximum number of Voice Channels (VCH) supported by the cell site is
22 since two of the 24 TRUs have to be assigned as the Control Channel
(CCH) and the Locate Channel Receiver (LCR). As traffic grows, four
additional RF frames can be added to the site to accommodate up to a
maximum of 120 channels, including the CCH and the LCR.
An RF Frame with up to 20 channels requires only one duplexer in the RF
Frame and one TX/RX antenna. The outputs of the three AutoTune
Combiners (ATC) are combined through one phasing transformer (located at
ATC 2) and then connected to Duplexer position 2. This configuration
requires a RX only antenna for the diversity receive function of the cell. See
Figure 3-2.
Frame and one TX/RX antenna. The outputs of the three AutoTune
Combiners (ATC) are combined through one phasing transformer (located at
ATC 2) and then connected to Duplexer position 2. This configuration
requires a RX only antenna for the diversity receive function of the cell. See
Figure 3-2.
An RF Frame with 21 channels or more requires two duplexers in the RF
Frame and two TX/RX antennas. The outputs of the lower and middle ATCs
Frame and two TX/RX antennas. The outputs of the lower and middle ATCs
Important
For ALL Metrocell cell site configurations, the frequency
plan used should have a minimum of 21 channel spacing
(630 kHz) between the channels in one RF Frame.
plan used should have a minimum of 21 channel spacing
(630 kHz) between the channels in one RF Frame.