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of each) to access 4 user groups (user E1), and we refer these 4 user E1 as
cross groups 5, 6, 7 and 8.
The first user E1 is a main cross group and channels of this cross group will
be distributed to user cards by default. Other user E1s are single cross group
for different slots: 1 MCU version is REV1.2 and versions below this: user
card in first slot will occupy cross group 6 (user E1 2) and user card in
second slot will occupy cross group 8 (user E1 4), user card in the third slot
cannot have single cross group. 2 MCU versions are advanced than
REV1.2: cross group 6, 7 and 8 (user E1 2, 3 and 4) are single cross group
for user card in slot 1, 2 and 3.
Limitation for main cross group (user E1 1): when use main cross group to
transfer data the number of channels will not same for different slots. Channel
number range for first slot is 0-31, 0 indicates that shutdown the transmission
of this user card, and the startup channel is channel 1. If other slots have
already occupied the channels of main cross group there will alarms.
Channel number range for second slot is 0-23, 0 indicates that shutdown the
transmission of this user card, and the startup channel is channel 9. If other
slots have already occupied the channels of main cross group there will
alarms. Channel number range for the third slot is 0-15, 0 indicates that
shutdown the transmission of this user card, and the startup channel is
channel 17.
Limitation for single cross group: Channel number range is 0-31; the startup
channel is channel 1 and there will not be channel occupation collision
alarms.
Point-to-point communication can be realized by automatic channel distribution, and
we recommend you list the cross connect table first to avoic mistakes.
7.7.2. V35 interface definition
V35 interface uses V35/HDB26 female connector and can be connected to standard
DTE cable as in following figure:
Figure 31
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