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Network Timing Modules
E1-Node Timing Module (NTM-E1)
032R440-000
Xedge 6000 Hardware
6-5
Issue 17
Installation & Setup Guide
Jumper Settings
The
X1
Input Impedance jumper allows you to select the input impedance for the RC IN connector
signals:
75 ohms
or
120 ohms
.
The
X2
Chassis Ground jumper allows you to select balanced (
BAL
) or unbalanced (
UNBAL
) for
the RC IN connector signals. As shown in
, with Unbalanced mode, pin 3 connects to
chassis ground. With Balanced mode, pin 3 is isolated from chassis ground.
Figure 6-4
NTM-E1 Jumper Positions
Cabling
The NTM-E1 can use a 120 ohm shielded twisted pair cable, following
law. The maximum
insertion loss is 6 db at 2048 kHz. The cable terminates with male DB15 connectors. With this
cable, the Input Impedance jumper must be set to
120
.
The NTM-E1 can also use a 75 ohm coaxial cable, following
law. The maximum insertion loss
is 6 db at 2048 kHz. With this cable, a DB15 to BNC adaptor is required, and the Input Impedance
jumper must be set to
75
.
Note
IMPORTANT! In some installations with specific RF/EMI problems, it may be desirable to use the Input
Impedance jumper to disconnect the shield-to-chassis ground connection for the RC IN link.
Table 6-2
E1 Node Timing Module
Connector
Signal Name
Pin Number
(Balanced Mode)
Pin Number
(Unbalanced Mode)
Received Clock Input
(RC IN)
Receive Return
3
- -
Chassis Ground
- -
3
Receive Signal
11
11
Chassis Ground
shield
shield
75
120
U NB A L
BAL
X1
X2
F
F