User's Manual

User’s Manual for Node C Network Elements
Page 76
M0121A1A_uc.doc
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).
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.
Power supplies
(right: optional)
DCM modules
UL DL
Position of
optional
modem
Duplexers
Final amplifiers
DL UL
Distribution and
interface board
RF and DC
Distribution
Unit
CD for
US
B driver