User manual

Raisecom Technology Co., Ltd
8
5
th
bit Loop-back type option
OFF Remote loop-back enable
ON Local loop-back enable
Figure2: sketch map of setting remote loop-back on local site
Figure3: sketch map of setting local loop-back on local site
Note: When any loop-back is set on local site, 1
st
~ 4
th
loop- back DIP-switch of remote site
must be all off (not loop-back).
The default status of this switch is “enable loop-back”. This switch cannot be viewed or
controlled by network management software. When setting loop-back test by software, first
ensure the switch is in default status.
• 6
th
bit: Fault-Pass-Through capability switch
When FPT is disabled, it’s similar to AIS of traditional multiplexers. When E1 signal on
remote site is lost, the E1 output opposite of local site is “1”; when optical signal at local site
is lost, all E1 output are “1” on local site.
FPT enable: when there is alarm of LOS on any direction of optical interface, both sides E1
output can not transmit HDB3 coding. At this circumstance, alarm on terminal device (such
as switches, converters, SDH) of E1 link will be LOS, not AIS alarm.
6
th
bit FPT
OFF Disable (complies with AIS)
ON Enable
This function is for some special need. It can be inquired, but can’t be controlled. So if it is
required to start, it must be forced manually.
Local
Remote
Fiber
E1
E1
Multipl
exer
BER tester
Multipl
exer
Local
Remote
Fiber
E1
E1
Multipl
exer
BER tester
Multipl
exer