Components Of The Node C And Interface Unit - Andrew Node C837 User Manual

5.3 COMPONENTS OF THE NODE C AND INTERFACE UNIT

The actual configuration can be seen at the configuration list*, which is part of the
delivery.
The following figure shows a Node C 1943** (layout of Node C 843 is the same) and
an Interface Unit with PSU redundancy option (two power supplies).
* To be replaced by an electronic door label that will be accessible via software & remote control.
** The layout of a Node C x37 differs from the Node C x43 only in the design of the DL final
amplifier (see chapter 5.3.5 Downlink Final Amplifier).
Final amplifiers
DL UL
figure 5-6 Layout of a Node C 1943 and Interface Unit
5.3.1 Duplexer
The duplexer is used to isolate the uplink from the downlink, i.e. to separate the
transmitting path from the receiving path. The pass band of the duplexer is the full 60
MHz of the CDMA band. This allows the same Node C to be used regardless of its
operator's frequency plan.
The integrated LNAs (low noise amplifiers) are biased via the RF cable from the
DCM module. The DL/LNA can be bypassed for strong input signals by the DCM
module automatically.
Page 76
User's Manual for Node C Network Elements
DCM modules
UL DL
RF and DC
Distribution Unit
Duplexers
PRELIMINARY
Power supplies
(right: optional)
CD
USB driver
Position of
Distribution and
interface board
M0121A1A_uc.doc
for
optional
modem