Specifications

Page 26–4
FOCUS System Manual
menu or click on the “Unlock FOCUS
Chassis” speed button .
This puts the chassis — and the module —
into a configurable state. It also automatically
configures the module to its default settings.
5. Connect your test equipment to the
6NR/6NV interface module.
Carefully wire a DB25 male connector for
your test equipment, as follows:
If you are using a Lynx Digital Network
Tester, remember that there are two different
connectors at the back of the Lynx: a V.35 and
an X21. See Table 26-1 for X21 pin-to-pin
connections.
If you are using a Fireberd Model 6000A
equipped with the V.35/RS-449/X-21
interface adapter, connect the FOCUS
interface and the Fireberd using the pin
connections shown in Fig. 26-2. Always
maintain the correct polarity.
When testing a 6NR module, you must
connect to the X21 connector according to the
pin connections in Table 26-1. Again, be
careful to maintain the correct polarity.
When testing a 6NV module, you must
connect to the V.35 connector, being sure to
use the correct polarity. Table 26-2 shows the
pin-to-pin connections between the V.35 and
the FOCUS DB25 female connector.
6. Set the test equipment settings.
Follow the setup menu in the Fireberd or the
Lynx to make sure the test frequency and the
interface are the same on the test equipment as
it is on the 6NR/6NV module. This should be
the default settings of 64 kbps data rate and
the electrical interface.
7. Put the FOCUS transceiver(s) in loop back.
You can do this either through the FCS or by
a cable connection.
To make the loop back using the FCS,
execute the “Turn On Local Loop Back…”
command on the FCS Test menu for each
transceiver (e.g., X1-1, X2–1) on the chassis.
(See the FCS online help facility: Loop Back
Functions ↓ Transceiver Loop Back Tests ↓
Turning On a Loop Back Test).
To make the loop back using cables, connect
one end of the (fiber optic or twisted pair)
cable to the “XMIT A” connection on trans-
ceiver one (XVCR-1) and the other end to the
“RCV A” connection on the same transceiver.
If a XCVR-2 is installed, connect a cable to it
in the same way.
Either method loops the signal back through
the 6NR/6NV module and the test set.
8. Observe the test results.
If the TX and RX LEDs on the module are lit,
this indicates that data is flowing through the
module. Also, if the Bit Error and Block Error
windows on the test set should display a zero
(0), this indicates that data is flowing error
free and continuously through the module and
the test set.
9. 6NR (RS-422) Interface
Using a 6NR interface, connect one 6NR
module to the FireBerd’s 6NR cable. Connect
the LOOPBACK connector to the second
6NR module.
Set the FireBerd options as follows:
• Synth freq. 64.0kHz
• Int. setup 449V35
• Type 422T
• Emulate DTE
• Char format
• Data 8
• Parity None
• Stop 1
Configure the module to N=1 and map FOCUS to
allow communications between modules. The
receiver section of the FireBerd should show all
three LEDs on (MK=Yellow, SP=Yellow,
SYNC=Green & the SYNC Lost indicator OFF).
The error count should be zero.