ATL Telecom OM25 - Manual (Page 16)

ATL User Guide
OM25 O
Optical M Modem
16
5. INTERFACES & TIMING OPTIONS
5.1 V.35 INTERFACE
5.1.1 USER RATE
User rates from 64K to 2304K (n = 1 to 36) can be configured; however, if the remote end is using
G703, the maximum data rate at the V35 end is 2048K (n = 32).
5.1.2 END TO END SIGNALLING
When On
Circuits 105 and 109 are transmitted end-to-end across the link, ie the state of 105 at one end is
mirrored by the state of 109 at the other.
When Off
Circuits 105 and 109 are not transmitted across the link. Their states are only relevant to the local
unit.
5.1.3 SIGNALLING CIRCUIT OPTIONS
106 Normal / Set On
107 Normal / Set On
109 Normal / Set On
Circuits 106, 107 and 109 can act according to X21bis V35, or can be set permanently ON.
5.1.4 EXTERNAL TIMING
Tandem sections require an adaptor cable (not supplied, wiring information shown in section 8.7.4)
so that two OM25s can be plugged together back to back via their user interfaces. Selecting
External Timing ON on one of the units will then allow the two CO’s to lock timing.
Fig 8 - External Timing
OM25
CPE
OM25
CO
Ext timing Fibre
OM25
CO OM25
CPE
Adapter
cable
Terminal
G703 / V35
G703 / V35
Fibre
Terminal
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