6
There is a coded switch S5 on the panel, which is used as the system configuration switch to set such
functions as clock, time slot, phase, loopback and Pseudo-random code test etc.
Wherein, S5.1 and S5.2 are clock settings.
S5.2
＝
OFF
：
network clock at E1 interface. (Received Recovered) (S5.1 in whatever status)
S5.1
＝
OFF
，
S5.2
＝
ON
：
network clock at the optic fiber interface (Received Recovered).
Remote time slot setting can be tracked only at this status.
S5.1
＝
ON
，
S5.2
＝
ON
：
using local crystal oscillation generating clock.
S5.3: time slot setting.
S5.3
＝
OFF
，
using remote time slot setting (valid only when S5.1
＝
OFF
，
S5.2
＝
ON)
S5.3
＝
ON
，
using local time slot setting.
S5.4: Reserved.
S5.5: Local loopback setting (optic interface in direct loopback), ON valid.
S5.6: Local digital loopback (E1 interface loopback), ON valid.
S5.7: Remote digital loopback (remote optic interface loopback), ON valid. Non-framing mode is invalid.
S5.8: Pseudo-random code test, ON valid, and valid at loopback status.
IT-7301-PC bottom coded switch
：
E1 Fiber Modem bottom Coded Switch
Default: non-frame mode, time slot 0 is ON.
IT-7301-PC/DC rear panel
：
IT-7301-PC/
DC Rear Panel Schematic
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
E1 TS
0
7
15
23
31
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
1 2 3 4 5 6 7
8
ON
E1 TS
0
7
15
23
31
Содержание IT-7301-PC
Страница 1: ...User Manual IT 7301 PC...
