4.3 CONNECTION TO THE G.703 NETWORK
The Model 2703RC supports 2.048 Mbps communication over an
unstructured G.703 network. Both 120 ohm and 75 ohm interface
cards are available (see Figure 7, below).
4.3.1 TWISTED PAIR (120 OHM) CONNECTION
The Model 2703RC DB25/R45 rear card (Model 1000RCM703120)
is equipped with a single RJ-45 jack for connection to a 120 ohm twist-
ed pair G.703 network interface. The pinout of this jack is as follows:
RJ-45 Pins
SIGNAL
1 & 2 . . . . . . . . . . . . Receive pair (from network)
3 . . . . . . . . . . . . . . . Shield reference point
4 & 5 . . . . . . . . . . . . Transmit pair (to network)
6 . . . . . . . . . . . . . . . Shield reference point
7 . . . . . . . . . . . . . . . Not used
8 . . . . . . . . . . . . . . . Not used
14
Switching the Power Supply On and Off
The power supply on/off switch is located on the front panel.
When plugged in and switched on, a red front panel LED will glow.
Since the Model 1000R16 is a “hot swappable” rack,
it is not neces-
sary for any cards to be installed before switching on the power supply.
The power supply may be switched off at any time without harming the
installed cards.
NOTE: Please refer to the Model 1000RP Series User Manual
AC
and DC Rack Mount Power Supplies for fuse and power card
replacement information.
4.2 INSTALLING THE MODEL 2703RC INTO THE CHASSIS
The Model 2703RC is comprised of a front card and a rear card.
The two cards meet inside the rack chassis and plug into each other
by way of mating 50 pin card edge connectors. Use the following
steps as a guideline for installing each Model 2703RC into the rack
chassis:
1.
Slide the rear card into the back of the chassis along the
metal rails provided.
2.
Secure the rear card using the metal screws provided.
3.
Slide the card into the front of the chassis. It should meet the
rear card when it’s almost all the way into the chassis.
4.
Push the front card
gently into the card-edge receptacle of
the rear card. It should “click” into place.
5.
Secure the front card using the thumb screws.
NOTE: Since the Model 1000R16 chassis allows “hot swapping”
of cards, it is
not necessary to power down the rack when you
install or remove a Model 2703RC.
13
Notice!
Any modular twisted pair cable connected to
the rear card must be shielded cable, and the outer shield
must be properly terminated to a shielded modular plug
on both ends of the cable.
Figure 7. Rear interface card options for the Model 2703RC
DB-25 Female
DB-15 Female
Model
1000RCM703120
Model
1000RCM70375
RJ-45 (120 Ohm)
Dual BNC (75 Ohm)
TX
RX
