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Modem-Converter E1-L/S
© 2006 Cronyx
The
«Transmit clock»
command sets the E1 link transmit clock source:
• «Internal» – from internal oscillator.
• «From Link» – from the E1 link.
• «From Port» – from the ETC line of the digital port.
The
«Timeslot 16»
command sets the timeslot 16 assignment mode (in «Framing: E1»
mode only):
• «Use» – use timeslot 16 for data transmission.
• «Skip» – use timeslot 16 for generation of standard CAS signals.
Timeslot 16 can be used for generation of standard CAS clock signals and signal bits
(abcd=1111, xyxx=1011) in which case the timeslot cannot be used for data transmis-
sion.
The
«Crc4»
command sets the check of multiframe alignment on CRC4 mode (in
«Framing: E1» mode only):
• «Generate» – generate CRC4 multiframe alignment using the S
i
bit of the timeslot 0,
but don’t check it.
• «Generate and check» – generate CRC4 multiframe alignment and check its presence
on input. Loss of the CRC4 multiframe alignment will cause the loss of synchroniza-
tion on remote device.
• «Disabled» – set the S
i
bit to 1.
The
«Receiver gain»
command sets the receiver gain of the E1 link:
• «Low» – low gain (12 dB);
• «High» – high gain (43 dB).
The
«Monitoring channel bit»
command sets the bit to be used for monitoring channel
(in «Framing: E1» mode only). Monitoring channel is used for the remote device control
and statistics data transmission. By default, the S
a4
bit of the timeslot 0 is used for moni-
toring channel in accordance with the ITU-T Recommendation G.704. It’s possible to
select any bit of any timeslot other than timeslot 0 for monitoring channel.
The
«Auto remote loopback»
command enables or disables the ability of automatic
loopback activation by request from the remote device (in «Framing: Unframed» mode
only).
The
«Loss of sync action»
command sets the type of response to a loss of E1 link syn-
chronization:
• «AIS» – in case of loss of signal or loss of frame synchronization AIS («blue code»)
is transmitted to the port.
• «Remote Alarm» – set bit A of the timeslot 0.
The
«Line code»
command toggles the line code mode between HDB3 and AMI.
The
«Scrambler»
command enables or disables the scrambler. The scrambler is used to
eliminate long sequences of zeroes and ones in G.703 output signal.
Summary of Contents for E1 - L/S
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