Avaya 03-300430 User Manual

Bit Rate

Select domestic T1 operation or international E1 operation for all facilities in 
the TN1654 DS1 converter complex:

●

1.544 Mbps for T1 operation

●

2.048 Mbps for E1 operation

Appears on the fiber-link screen only for TN1654 DS1 converter circuit 
packs.
The TN1654 DS1 converter circuit pack is also field configurable for T1 or E1 

operation. All four DS1 facilities are configured to either T1 or E1 as a group 

via an option switch located on the component side of the circuit pack. An 

error is logged and an alarm is raised if there is a T1/E1 inconsistency 

between the administered bit rate and the board option switch setting.

Idle Code

Set the idle code for all facilities on the TN1654 DS1 converter board. This 
field can accept any combination of ones (1) and zeros (0) with the 
exception that the second left-most digit must be set to one (1) at all times.
Appears on the fiber-link screen for TN1654 DS1 converter circuit packs

CRC

This field determines if CRC is enabled for every facility on a TN1654 circuit 
pack. The field is y if a cyclic redundancy check (CRC) is to be performed 

on transmissions that the board receives.
CRC only applies to E1 operation and appears on the Fiber-link screen only 
for TN1654 DS1 converter circuit packs with a bit rate of 2.048 Mbps.

DS1 

Converter-1 

and 

DS1 

Converter-2 

Line 

Compensation

The DS1 facility line signal is pre-equalized at the transmitter on the DS1 
converter circuit pack so that DS1 line pulses have correct amplitude and 
shape when they reach the Network Interface (see 

on page 1068). The amount of equalization necessary is 

determined by the distance to the Network Interface, and also by the type of 
wiring used to connect to the Network Interface. If the equalization is not set 
to the correct value, potentially high error rates (errored seconds) will be 
observed on the DS1 facility. 

on page 1060 explains how equalization values are 

determined.
Line compensation is applicable only to T1 operation, thus these fields will 
not appear on the fiber-link screen if the TN1654 DS1 converter is 
administered for a bit rate of 2.048 Mbps.

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