The E1 link interface supports PCM 31 frames (time slot 16 available
for user’s data), and PCM 30 frames (time slot 16 not available for user’s
data). WireSpan 600 also supports the CRC-4 option specified in ITU-T
Rec. G.704. The framing mode and the use of the CRC-4 option are
independently selectable by the user.
In addition, WireSpan 600 can also operate in the unframed mode. In
this mode, WireSpan 600 / 610 operates as an interface converter, enabling
the transfer of unstructured 2.048 Mbps data streams (or data streams with
proprietary framing generated by equipment with ITU-T Rec. V.35, EIA
RS-530, EIA RS-449), and X.21 interfaces via the E1 network.
Note
The WireSpan 610 always operates in unframed mode.
The user can select the number of main link time slots used to carry
the payload data.
The timing of the receive path of the Wirespan 600 / 610 E1 link
interface is always locked to the clock signal recovered from the received
line signal. The timing of transmit path can be locked to one of the
following three sources:
z
Internal clock oscillator, having an accuracy of ±30 ppm
z
The recovered receive clock signal. The maximum track
range is ±130 ppm
z
Lock data port clock signal. The maximum track range is
±100 ppm
Control of WireSpan 600 Operation
WireSpan 600 is designed for fully automatic, unattended operation.
Its configuration is determined by keypads and LCD-menu. Top panel
LED indicators and LCD display show the operating status of WireSpan
600. Various indicators display the E1 link status and user’s data port
status, and alert when an alarm condition (major or minor) or test loops are
present in the system.
WireSpan 600 / 610 has comprehensive diagnostic capabilities that
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