Tainet DT-2000 Series, Руководство пользователя

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INSTALLATIONS 3-3
v
HDSL Loops Connection
For DT-2000F loop connection, there is a RJ-45 phone jack with 8-pin connector on
the rear panel that can be used to connect two loop wires together (Tip/Ring). User may
connect DT-2000 loops refer to Fig.3-5 and Fig.3-6 previously. The Loop1 uses
Loop1_Tip and Loop1_Ring to connect to remote Loop1, and Loop2 uses Loop2_Tip
and Loop2_Ring to connect to remote Loop2 via both full-duplex of 2B1Q modulation.
v
E1 Connection
For all DT-2000 series can accommodate data up to an E1 channels. Either terminal
block for balanced E1 (120
Ω
) or the BNC connectors for unbalanced E1 (75
Ω
) on the
rear panel can be used to connect the E1 facility.
Cross connection on the pins named Tx (Tip/Ring) to the receive side of E1 panel Rx
(Tip/Ring), cross connect Rx (Tip/Ring) to the transmit side of E1 panel Tx (Tip/Ring).
HDSL
RX
TX
HDSL
Loop1
Loop2
RX
TX
Terminal
RX
TX
E1
RX
TX
Terminal
E1
Fig.3-5 An example of Line and E1connection
For some longer connection on real network, the Tip and Ring may reversal connection
by field; it works normally but shows as warning messages.
3.2.3 Clock Source Configuration
On synchronous transmission system, whole E1 system should synchronize one and only one
clock source. Thus the CO site clock source may set as E1 terminal (Co-directional), E1-C
network (loop clock recovery), or provide by DT-2000 internal clock (E1-C Internal) for
whole system to follow up. As to the RT site, the clock source will follow automatically with
CO site.
•
When clock sources apply independently for CO and RT equipment.
Item CO Site RT Site
System Type E1- C E1- R
Frame Format Unframe Unframe
Set E1 Clock CODIRECTIONAL CODIRECTIONAL