5.1.2 Opening the Case
Open the case by inserting a screwdriver into the slots and twist
the screwdriver head slightly. The top half of the case will separate
from the lower half of the case. Take caution not to damage any of the
PC board mounted components.
5.1.2 Connecting the Twisted Pair (120 ohm) to the G.703
Network
The Model 2701/I is equipped with a single RJ-48C jack for con-
nections to a 120 ohm twisted pair G.703/G.704 network interface. If
your G.703/G.704 network terminates via RJ-48C, use the connection
diagram (Figure 7) following the pinout and signals chart below to con-
nect the 120 ohm G.703/G.704 network channel.
RJ-45 Cable (8-Wire)
G.703/G.704
2701/I
NETWORK SIGNAL
SIGNAL
PIN#
RX+
1-----------------------TX+
RX-
2-----------------------TX-
TX+
5-----------------------RX+
TX-
4-----------------------RX
Shield
3-----------------------Shield
Shield
6-----------------------Shield
13
5.2 Connecting the 10Base-T Ethernet Port to a PC (DTE)
The 10Base-T interface is configured as DTE (Data Terminal
Equipment). If the Model 2701/I is to to connect to another DTE
device such as a 10Base-T network interface card, construct a
10Base-T crossover cable and connect the wires as shown in the dia-
gram below (Figure 8).
10BaseT Port
10Base-T DTE
RJ-45 Pin No.
RJ-45 Pin No.
1 (TD+)
1 (TD+)
2 (TD-)
2 (TD-)
3 (RD+)
3 (RD+)
6 (RD-)
6 (RD-)
5.3 Connecting the 10Base-T Ethernet Port to a Hub
The 10Base-T interface is configured as DTE (Data Terminal
Equipment), just like a 10Base-T network interface card in a PC.
Therefore, it “expects” to connect to a 10Base-T Hub using a straight-
through RJ-45 cable. Use the diagram below (Figure 9) to construct a
cable to connect the 10 BaseT interface to a 10Base-T Hub.
10BaseT Port
10Base-T Hub
RJ-45 Pin No.
RJ-45 Pin No.
1 (TD+)
1 (RD+)
2 (TD-)
2 (RD-)
3 (RD+)
3 (TD+)
6 (RD-)
6 (TD-)
14
(No Connection) 8
(No Connection) 7
(No Connection) 6
(TX+) 5
(TX-) 4
(No Connection) 3
(RX-) 2
(RX+) 1
8
7
6
5
4
3
2
1
1 TD+ (data output from 2701/I)
2 TD- (data output from 2701/I)
3 RD+ (data input to 2701/I)
4 (no connection)
5 (no connection)
6 RD- (data input to 2701/I)
7 (no connection)
8 (no connection)
1
2
3
4
5
6
7
8
Figure 7: G.703/G.704 170 Ohm Connection.
Figure 8: Connecting the 10Base-T Ethernet Port to a PC
Figure 8: 10Base-T Cross-over Cable Connection
Figure 9: Connecting the 10Base-T Ethernet Port to a Hub
