Product Info

METRO CELL OUTDOOR (DE/RE) CDMA BTS RADIO DEVELOPMENT
PROPRIETARY CELL SITE REQUIREMENTS
Feb. 2001 - 22 - Issue 01 Stream 00
9.0 T1/E1 Connections
The CM module has up to 6T1 interfaces connected through the backplane. The cable will
probably be lumped in two 12 wire bundles terminated at the digital shelf backplane by two 15
pin dsubs.
The Metro Cell can be connected to the BSC using 1 to 6 T1/E1 links. These T1/E1 links are
distributed between the two DCGs i.e. if one DCG has 4 T1/E1s connected to it then the other
can have a maximum of two T1/E1 links. All T1/E1s connected to each DCG need to have the
same timing reference at the BSC. Each link requires 2 twisted pairs.
There are two ways of connecting T1/E1 to the Metro Cell. The T1/E1 cables can be
directly brought into the DEI or they can be connected to a RJ48H connector which
interfaces with the DEI. The RJ48H connector cable NTGS0106 is provisionable. In the
DEI T1/E1 connections are done on the middle and lower blocks among the three
Telephone/Data Line Protection blocks as shown in Figure 87. The RJ48H connector is
shown in Figure 88 and the pinout is shown in Table 30.
The number of T1/E1s that need to be connected to the Metro Cell depends on the call
carrying capacity of the T1/E1s and the number of calls that a Metro Cell has to make.
The number of T1/E1 that need to be provisioned for a Metro Cell can be determined
from Ref [10].
The two modes of operation of Metro Cell are regular (or non-split) mode or split mode.
In the regular mode only one DCG is active, the other DCG may not be provisioned or is
a redundant DCG. In the split mode both DCGs are provisioned and are active. Each
DCG in the split mode is a logical BTS. The T1/E1 connections of the Metro Cell in the
regular and split mode are done as shown in Table 27.
The T1/E1 lines are connected to one of the two BTSI cards in the control module (CM)
Table 27: T1/E1 Connections of Metro Cell without Daisy Chaining