Synway Information Engineering Co., Ltd
HD: Depends on individual requirements
Supported Operating Systems
Refer to
SynCTI Programmer’s Manual.pdf
.
2.3 Installation
Procedure
Step 1: Configure the grounding jumpers.
Disconnect all grounding jumpers for use of the 100
Ω
T1, 110
Ω
J1 or 120
Ω
E1 balanced
twisted-pair cable.
In consideration of various line conditions, this series boards are equipped with two groups
of grounding jumpers on each channel which respectively control the groundings of the
transmitting and receiving ends. In case the 75
Ω
E1 unbalanced coaxial cable is used, the
grounding jumpers at the receiving end should be disconnected while those at the
transmitting end should be short-circuited, provided that the PC is properly grounded. This
configuration is the factory default setting and applicable to most situations so that there is
usually no need to change it.
If it is difficult to ground the local PC, you may short-circuit the
on-board grounding jumper at the receiving end and use the transmitting end at the
opposite terminal for grounding. If the receiving end at the opposite terminal is grounded
(improper operation), the on-board grounding jumper at the transmitting end must be
disconnected. Refer to Table 2-4 for details.
Generally speaking, even in the case of proper grounding at both terminals, only the
external layer of the E1 coaxial cable at the transmitting end is allowed to be grounded. The
grounding of both transmitting and receiving ends may result in a current loop with ground
wires, bringing instability to signals. Therefore, such grounding must be strictly avoided.
Synway SSW Series E-type Digital Trunk Boards Hardware Manual
(Version 1.1)
Page 15
