Table 4-1. La And Lb Leads - ADTRAN T3SU 300 User Manual

Lead descriptions for both the HSSI and the V.35 interfaces are as
follows:
HSSI Interface Leads
TA (terminal available)
CA (communications
equipment available)
LA (loopback circuit A)
LB (loopback circuit B)
LC (loopback circuit C)
TM (test mode)
Both TA and CA must be on before data will flow.
61202217L1-1B
Condition
Asserted by the DTE to indicate readiness to
transmit data.
Asserted by the T3SU 300 to indicate readiness
to transmit data.
The condition reflected by this lead is
dependent upon the LB lead. See Table 4-1.
The condition reflected by this lead is
dependent upon the LA lead. See Table 4-1.
Asserted by the unit to request a loopback from
the DTE.
Asserted by the T3SU 300 when either the
network or the port is being tested.
LA LB
Off Off
On Off
Off On
On On
T3SU 300 User Manual
Chapter 4. Status

Table 4-1. LA and LB Leads

Condition
No test (normal)
Local line loopback
Remote line loopback
Local DTE loopback
75