User manual

Chapter 5. Loop Back Testing
46 Version 1.2 Apr 2006
5.2.4 Datacom (RS-530, V.35, X.21, RS-449, RS-232) 4-Channel Port Card Timing
FMUX is DCE and provides clocks to connected DTEs (Internal Timing)
DTE DCE DCE DTE
TC TC
RC RC
FMUX is placed between existing DCE and DTE (External Timing)
DCE DTE DCE DTE
ETC TC
RC
FMUX is placed between two DCE devices (Transparent Timing)
DCE DTE DTE DCE
ETC TC, RC
TC, RC ETC
Int Osc
Rate = n x 64 where
n=1 to 32
Recover
(from optical)
Rate = n x 64
Ext Clk
Rate = n x 64 where
n=1 to 32
Recover
(from optical)
Rate = n x 64
Trans
Rate = n x 64 where
n=1 to 32
Trans
Rate = n x 64 where
n=1 to 32