Verilink 2048 (34-00179) Product Manual User Manual
Page 5
1-2
General
2048 PMU/NTU
1.1
Design Highlights
•
End-to-end user control and access to
extensive unit performance data
unit configuration
unit status (normal, looped, alarm)
•
AMI or HDB3 coding
•
User and PTT access via FDL link
•
Dual performance registers - User and PTT/carrier
•
Jitter control of network signal (per G.823)
•
Complete diagnostic capabilities, including multiple
loopbacks and built-in BERT
•
Front panel test jacks, alarm indicators, and test switch
1.2
Specifications
Network Interface
Line Rate:
2.048 Mb/s, ± 50 ppm, PCM-30
Multi-frame Type:
CAS and/or CRC4, or none
Line Code:
AMI or HDB3
Connection:
120 ¾ balanced or 75 ¾ unbalanced
Backplane:
DB15, Twin-axial, and BNC options
Output Signal:
75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703)
120 ¾ mark 3 V, space 0 ± 0.3 V
Line Build Out:
0, -7.5, -15 dB switch settings
Input Signal:
75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703)
120 ¾ mark 3 V, space 0 ± 0.3 V
attenuated by 0 to -27 dB (ALBO)
Jitter Attenuation:
per CCITT G.823
AIS:
Unframed or framed all ones, or
(user selectable)
line loopback
Overvoltage:
1000 V minimum protection
Equipment Interface
Line Rate:
2.048 Mb/s, ± 50 ppm, PCM-30
Multi-frame Type:
CAS and/or CRC4, or none
Line Code:
AMI or HDB3
Output Signal:
75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703)
120 ¾ mark 3 V, space 0 ± 0.3 V
Pulse Width:
244 ns, nominal
DTE Input Signal:
75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703)
120 ¾ mark 3 V, space 0 ± 0.3 V
attenuated by 0 to -6 dB at
1024 kHz (0 dB = 2.4 V)
Connection:
120 ¾ balanced or 75 ¾ unbalanced
Backplane:
DB15, Twin-axial, and BNC options
AIS:
Unframed or framed all ones, or
line loopback
Overvoltage:
1000 V minimum protection
Diagnostics
Line Loopback:
Signal regeneration only
Payload Loopback:
Signal regenerated with new frame
synchronization and CRC4
BERT:
63, 511, 2047, 2
15
(default), 2
20
,
2
23
, QRW, and ALT
BERT Activation:
Front panel switch for test. User
selection of BERT patterns via
command. Pattern sync and bit
errors reported via command.
Loopback Control:
Inband loop up, 00001 for Ý 5 sec
Inband loop down, 001 for Ý 5 sec
User enable/disable
Manual loopback switch
FDL loopback command
PTT and EM8000
Full ESF performance monitoring
through a terminal port (6-pin RJ11),
and via FDL in selected national bit
Jack Access
Toward Network:
Bantam jacks (In, Out, and Monitor)
Toward DTE:
Bantam jacks (In, Out, and Monitor)
Access Ports
User Net Manager:
Asynchronous, RS232
Telco Net Manager:
Asynchronous, RS232
Local Access:
Asynchronous, RS232
Bit Rates:
1200, 2400, 9600 or 19200 b/s
(all ports)
(switch selectable)
Formats:
8 data bits, 1 stop bit, no parity