Verilink DCSU 2911 (880-502647-001) Product Manual - Manual (Page 30)

DCSU T1 Craft Interface
3-8 Verilink DCSU 2911 User Manual
NDn Network Density: This option specifies the type of network density. Digital
transmissions over public switched telephone network lines cannot support
long strings of zeros (repeaters and clocking devices lose synchronization).
Therefore, the density algorithms ensure that a minimum pulse density is met
to ensure stable system timing.
Choose one of the following if using 64K AMI. Note that these options are
overridden by a B8ZS line code:
None: does not insert a one. Use this option always with B8ZS or a 56K channel.
80 Zeros: inserts a one into every string of more than 80 consecutive zeros.
15 Zeros: inserts a one into every string of more than 15 consecutive zeros.
12.5% & 80 Zeros: inserts a one into every string of eight or more consecutive
zeros when the average density of ones fall below 12.5% or if there are more
than 80 consecutive zeros.
TR 62411: inserts a one into every string of more than 15 consecutive zeros or
when there are less than a minimum number of N ones in every window of
8(N+1) data bits (12.5%). N can be any value from 1 to 23. This option is the
same as 12.5% + 15Z.
1) NONE
2) 80 zeros
3) 15 zeros
4) 12.5%
80s
5) TR
62411
NLn Network Initiated Loop: Use this option to specify if you wish to allow the far
end or telco to put your DCSU in a loopback.
Yes or No
(Y/N)
An Alarm Declare Time (sec): Use this option to indicate how many seconds will
elapse before a message regarding a problem is displayed.
0..127
seconds
DLn FDL Enable/PRM Enable: Facility Data Link (FDL). The ESF Facility Data Link
transmits framing information, error events, and loopback controls. FDL uses 4
kbit/s of bandwidth to transmit data. This window option only enables or
disables FDL. It only reports if you have the Performance Report Message
Command/Response (PRM C/R) bit enabled or disabled. To change this
option’s status or configuration, use F (FDL Configuration) and select Cn (PRM
C/R bit).
Yes or No
(Y/N)
F FDL configuration: Displays a submenu of choices, Figure 3-4 .
T Timing options: Displays a submenu of choices, Figure 3-5 .
X Exit this screen.
Command Description Options