Verilink T1 ESF CSU (34-00309.B) Product Manual Manual de usuario descargar pdf (Pagina 20)

ESTING

Network

Position SW1-6 sets network loopback functions. NET LOOP

can be set to Auto or Manual. “Auto” enables the unit to respond

to network loop requests (a 1-in-5 pattern) and remain looped

until it receives a 1-in-3 pattern. Setting the switch to “Manual”

forces the unit into a manual network loopback until the switch

is returned to Auto or loopdown code is received from the

network. The unit sends an unframed all ones pattern to the

equipment end unless the equipment is also in loopback.

Figure 3-2 Line or CSU Loopback

The following paragraphs describe other loops that may be

initiated on the unit. Refer to the looping diagrams below for

further information.

CSU Inband LLB:

Each unit can be looped remotely by

generating towards it a standard CSU line loopback code (00001

repeating for

≥

5 seconds, framed or unframed). Once looped,

the received signal from the T1 facility (NET IN) is regenerated

and transmitted back to the T1 facility (NET OUT).

CSU Inband Unloop:

Each unit can be unlooped remotely by

generating towards it a standard CSU line unloop code (001

repeating for

≥

5 seconds, framed or unframed).

T1.403 LLB:

The unit supports the T1.403 line loopback

command (the FDL LLB format is 00001110 11111111). Once

looped, the received signal from the T1 facility (NET IN) is

regenerated and transmitted back to the T1 facility (NET OUT).

T1.403 LLB Unloop:

The unit supports T1.403 FDL line

loopback unloop command messages (00111000 11111111

repeating).

T1.403 / 54016 PLB:

The unit supports T1.403 FDL payload

loopback command messages (00010100 11111111 repeating).

Figure 3-3 Payload Loopback (with Frame and CRC

regeneration)

Equipment

Network

AIS

Equipment

Network

AIS

CRC

FRAME

1 2 ... 15 16 17 18 19 20 21 22 23 24

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Verilink T1 ESF CSU (34-00309.B) Product Manual Manual de usuario Pagina 20

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