Verilink 2048 (34-00179) Product Manual - Manual (Page 4)

General 1-1 2048 PMU/NTU
General
1.0 Introduction
The TxPORT International 2048 PMU/NTU (Performance
Monitoring Unit/Network Terminating Unit) is an advanced
network device capable of operating in framed or multi-
framed (G.704) modes, using AMI or HDB3 line coding.
The 2048 is designed for CEPT E1 (2.048 Mb/s) connection
to the PTT (the national Postal, Telephone, and Telegraph
authority) by the user. The unit provides end-to-end inband
protocol via a selectable national bit. This allows one PMU
to interrogate and control the remote far end PMU.
The 2048 is equipped with a dual set of performance data
registers that hold line statistics for both the PTT and the
user. Each register set provides detailed status and perfor-
mance history for the network and equipment interfaces.
The PTT performance data registers may be accessed, read,
and cleared by the PTT. User registers can only be accessed
by the user. Both registers contain identical core perfor-
mance information, but the user registers also contain addi-
tional fields relating to unit configuration and status.
Performance data (per TR54016 and G.821/X) is collected
in 15-minute increments for the preceding 24-hour period
and in 24-hour increments for the preceding 30-day period.
The unit enables downloading of remote site performance
data from the far end PMU, in all modes of operation, using
the facility data link (user selectable national bits).
The PMU provides access to the data registers through one
front and two rear management ports. These ports provide
test, diagnostics, and control over the CEPT E1 network.
Program upgrades may be downloaded into electrically eras-
able memory (EPROM) in the field via the supervisory port
on the front panel.
Access can also be obtained through a data link using an
assigned national bit. The national bit data link uses the
54016 U.S. FDL TABS protocol and message set. Addi-
tional request/response FDL messages have also been added
to enhance the PMU’s operation. The TxPORT EM8000
network manager uses these messages to provide complete
end -to-end control and performance monitoring.
The 2048 also provides features to aid in quick fault isola-
tion. Front panel indicators display alarm and test condi-
tions. Test jacks allow bridged monitoring of the passed
signal and signal insertion toward the PTT or the user. A
front panel test switch activates local/remote loops and con-
trols the internal BERT generator and comparator.
The optional EM8000 Element Manager is available for
applications requiring multiple PMUs. The EM8000 pro-
vides access, control, testing, alarm reporting, and database
management functions.
BV/CR/FE
LOC FAR
ACO SW
ACO
LOS/LOF
AIS
REM ALM
LOC ALM
N
E
T
D
T
E
T
S
T
LLB
PLB
TST
ERR
FRM
NET
MON
TO
DTE
TO
NET
MON
FRM
DTE
S
U
P
V
2048
PMU/NTU
TxPORT 2048 PMU/NTU
T R A N S P O R T
®
5
1
7
9 0
6
8 2
3
4
SW1