Black Box ME621A Manual page 11

MODULAR FIBER CAMPUS DRIVER, MFCD PLUS
Position
S1-1*
S1-2*
S1-3*
S1-4*
S1-5
S1-6
S1-7
S1-8
Both models ME621A and ME620A use Switches S1-S4 to set the async
or sync data rate. Refer to the sections below to set the ME621A or
ME620A rates.
S S1-1
WITCH THROUGH
On ME621A, Switches S1-1, S1-2, S1-3 and S1-4 set two parameters: synchronous or
asynchronous data rate and the maximum transmission distance between two
Model ME621As.
S1-1 S1-2
On Off
Off On
Off On
On Off
On Off
Off Off
Off Off
Off On
Off Off
On On
10
Table 3-1. S1 Summary Table.
Function
Data Rate
Data Rate
Data Rate
Data Rate
Clock Source
Clock Source
DTE Control of DL
DTE Control of LAL
*NOTE
S1-4 (M ME621A:): A
ODEL
S1-3 S1-4
Off On
On Off
On On
On Off
On On
On Off
Off Off
Off Off
Off On
On On
Factory Default
Off
Off
Off
On
On
On
Off
Off
/S
SYNC YNC
Data Max. Distance
Rate (kbps) in miles (km)
0-19.2 3.0 (4.8)
4.8 3.0 (4.8)
9.6 3.0 (4.8)
14.4 1.5 (2.4)
19.2 3.0 (4.8)
28.8 1.5 (2.4)
32.0 3.0 (4.8)
56.0 1.5 (2.4)
64.0 3.0 (4.8)
128.0 3.0 (4.8)
}
64 kbps
}
Internal
Disabled
Disabled
D R
ATA ATE
Async Setting
}
Sync
Setting