Cronyx E1 - L/S, Руководство по установке и эксплуатации

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© 2006 Cronyx
Chapter 1. Introduction
LANs. While in unframed mode the E1-L modem may be used together with the PCM2
modem.
VLAN support is provided by implementing of Ethernet packets with the length enlarged
to 4224 bytes.
The device operation may be controlled from the console (ASCII terminal connected to
the RS-232 control port). The device is equipped with the dedicated Ethernet 10Base-T
port to support SNMP-based management.
The modem’s front panel indicators display the channels availability, loopbacks enable
and testing modes.
The built-in BER-tester allows the error level measurement in the E1 link. The meas-
urements are performed on the fixed or pseudorandom code subject to the ITU-T
Recommendation O.151 guidelines (supported length of sequence is 2
15
-1=32767
bits).
There is a capability of remote login to control the remote device operation from the
console port of the local device (this mode may be useful if there is no service person-
nel on the remote end of the link). Commands are transmitted to the remote device
via additional monitoring channel. This channel utilizes special bit of the timeslot 0 (in
accordance with the ITU-T Recommendation G.704) or any other user selectable bit
of any timeslot other than 0. The remote login capability is not supported in unframed
mode of operation.
The device is equipped with an emergency alarm relay. The state of the relay on the lo-
cal device depends on fault conditions detected and may be controlled from the remote
device. The relay operates in «dry contacts» mode and may be used for prompt mainte-
nance (according to the ITU-T Recommendations G.742 and G.751).
The firmware of the device may be updated by user. The instructions for updating the
firmware may be found at the www.cronyx.ru web site.
1.2. Operation
Data accepted from the digital interface port is placed into selected timeslots of the E1
stream for output through the E1 link. Unused timeslots are filled by ones.
Data retrieved from the selected timeslots of the E1 stream accepted from the E1 link is
transferred to the output of the digital interface port. Unused timeslots are ignored.
User may choose to disable E1 frame structure. In this case the whole bandwidth of
2048 kbps will be used for data transfer (bit data rate at the digital interface port may be
limited if required).