Product Info

METRO CELL OUTDOOR (DE/RE) CDMA BTS RADIO DEVELOPMENT
PROPRIETARY CELL SITE REQUIREMENTS
Issue 01 Stream 00 - 23 - Feb. 2001
The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)
which forms part of the DCG. The connections are controlled by relays and are exclusive
to one DCG. Therefore if T1/E1 #1 is connected to the first DCG then the same lines
cannot be connected to the other DCG. This is true in regular as well as split mode. In
regular mode since only one DCG is active, therefore, all the T1/E1s are connected to
the active DCG. When the redundant DCG takes over then the connections are switched
to it by closing the relays on this new active DCG and opening them on the previously
active DCG. The middle column of Table 27 shows how the T1/E1 connections are done
for the active DCG in regular mode. In the split mode each DCG is active and is part of
the logical BTS. Therefore, each DCG has its own independent T1/E1 connections. The
right column of Table 27 shows how the T1/E1 connections are done for the two logical
BTSs in the split mode. It is clear from [1] that a single DCG, supporting a maximum of
two carriers, does not need more than 3 T1/E1 connections. So, the connections shown
in Table are reasonable and will provide for a redundant T1/E1 link per logical BTS in
most cases (keeping in mind the number of T1/E1 links needed for 2 carriers as
mentioned in [10]).
The Metro Cell can be configured for a shorthaul link or a longhaul link. In case of a
shorthaul configuration the Metro Cell should be within 655ft of the last repeater while for
a longhaul link the Metro Cell should be within 6000ft of the last repeater using 22 gauge
unshielded twisted pair cable i.e. 100 ohm 22 gauge cable. The shorthaul and longhaul
link is configured using software. The distance of the Metro Cell from the last repeaterhas to
match the software configuration.