Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 191)

Configuration Options for 551VST Elements
Access Manager 2000 User Manual 5 -67
This option has a default setting of NO and should remain set to NO
unless the CSU circuit element is to transmit an unframed signal using
B8ZS. Presently, only certain U.S. government agencies are allowed to
use the unframed format on the public network.
In the transparent mode, if an unframed signal is received from the EQP
and the CSU is not in an inband loopback mode, all BPVs received from
the EQP are passed straight to the network.
In the non-transparent (normal cut-through) mode, with an unframed
signal, all BPVs from the EQP are removed, except those resulting from
B8ZS encoding.
When you choose this mode ( YES ), the circuit element stuffs a ONE into
every string of eight (8) consecutive ZEROs whenever either the average
density is below 12.5% or there are more than 80 consecutive ZEROs
(referred to as FCC Part 68 Rule in earlier manuals). This is the default
setting.
If you choose NO , this rule is still applied, plus the AT&T TR-62411
density enforcement rule is additionally applied.
This option determines whether the AIS or the received signal is passed
on to one side when the other side is looped back. For example, if a line
loopback (LLB) is activated and this option is enabled (
YES ), an AIS
signal is transmitted to the EQP.
If an LLB occurs with this option set to NO , the received signal from the
network is transmitted to the EQP during an LLB. The default setting for
this option is
YES .
Note: An RLB always passes the signal to the network, regardless of
this option setting.
This option determines whether:
■
AIS (unframed ALL-ONEs) is transmitted to the network, or
Enable
Transparent Mode
Use FCC Part 68
Rule Only
AIS (Not Signal)
Loopback
AIS (Not ESS)
Keep-Alive