User manual

Linecode for E1: AMI, HDB3
Framing for E1: CRC4, no-CRC4
Linecode and framing must match on CPE and simulator. If you experience a large number of CRC
errors, packet loss or connectivity problems, always check linecode and framing rst and ensure
that it matches on both ends.
6.2.3 Line build-out
Line build-out ensures signal attenuation compensation for long cable runs. If you connect to a simulator
with a cable grater than 100 ft. long, select the appropriate line build-out.
6.2.4 Clock source
Clock source is the one of the most important parameters in ensuring awless operation of T1 or E1 lines.
PSTN simulator’s PRI module requires that module itself (network) should provide a clock to connected
devices. If you connect a router or another CPE device with a T1/E1 interface to a simulator PRI interface,
congure it to use a network clock provided by simulator for synchronization purposes.
6.2.5 Conguring PRI Switch type
PSTN simulator PRI module conforms to a different PRI switch signaling options:
National ISDN 2
ATT/Lucent 5ESS
Nortel DMS-100
Q.931 Q.SIG
6.2.6 Scan Order
“Scan Order” parameter denes the B-channel selection order for outbound calls. When simulator places a
call to an end device it has to select an outgoing B-channel. If the “ascending” order is congured simulator
will select the lowest B-channel available. It will select a highest B-channel if the “descending” order is
congured.
With a high call rate it is statistically possible that the end device and the simulator will try to seize the same
B-channel resulting in the event called glare. To prevent glare from occurring it is advisable that the CPE
and the Simulator use different B-channel selection orders.
6.2.7 Conguring PRI Phone numbers
You can congure up to 30 phone numbers on the “Phone numbers” tab in PSTN Manager.
Phone numbers are not associated with any particular B-channels which are being allocated based on
“Scan Order” parameter value.
6.2.8 Simulating Network Delays
To add transmission delays to B-channels, similar to the ones existing in satellite based links,
select the desired delay timer from 1ms to 500ms on Tools tab.
Delays apply to B-channels only, and not to D-channel. Default value is: 0 ms (no delays)
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User Manual
Public Switched Telephone Network (PSTN) Simulators