Verilink 2048 (34-00179) Product Manual Uživatelský manuál stáhnout pdf (Strana 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

(default), 2

, 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

1 2 3 4 5 6 7 8 9 10 ... 32 33

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