User manual

Appendix A
54
DIP Setting Function Description
OFF HDB3 (BZ8S)
1
ON AMI
Line Code
OFF Disable
2
ON Enable
FEF
3 4 Loop Back Selection
OFF OFF Normal
ON OFF LLB - Local Loop Back
OFF ON RLB - Remote Loop Back
3
&
4
ON ON RRLB - Request Remote LB
Table A-? DIP setting table for FRM-E1 and FRM-T1
The FRM-E1 and FRM-T1 may also be applied in a transparent DSU/CSU configuration, ie. paired with an
FRM-DATA converter. Below are some typical clocking applications when paired in this configuration.
FRM-E1/T1 FRM-DATA
E1/T1 Datacom
recovery
Figure A-? E1/T1 with Datacom (V.35, X.21, RS-530 etc.) termination
In the above example, the connected E1/T1 equipment provides the clock source for the FRM-E1/T1 converter.
The FRM-DATA recovers the clock from the fiber and acts as a DCE to any connected DTE device (such as a router).
Because this is a transparent application, the data rate must be 2.048Mbps (1.544Mbps for T1), clear channel.
FRM-DATA FRM-E1/T1
Datacom E1/T1
external
Figure A-? E1/T1 extension from Datacom network
In the example above, a serial datacom network provides clock and data to the connected FRM-DATA. The
data is then transmitted transparently over the fiber and recovered by the FRM-E1/T1, where data is transmitted at
the received data rate. Because this is a transparent application, the data rate must be 2.048Mbps (1.544Mbps for
T1), clear channel.
FRM-E1/T1 FRM-DATA
E1/T1 Datacom
internal
Figure A-? Another application with FRM-DATA as clock source
Fiber
T
RX
TX
RC
Fiber
T
ETC
RX
Fiber
T
RX
TX
RC