Avaya S8700 Maintenance Manual page 516

Maintenance Object Repair Procedure
The Enhanced Integrated CSU is for use in the United States of America with
1.544-Mbps DS1 service. For further details on the 120A1 CSU module refer to
DEFINITY Communications System Generic 1, Generic 2, and Generic 3 V1 and
V2 - Integrated CSU Module Installation and Operation.
2Mbit Japan Trunk (TN2242)
The TN2242 2-Mbit, 30-port trunk circuit pack supports Japanese TTC private
networking environments. This circuit pack interfaces only with network
equipment or other circuit packs of the same model and is incompatible with every
other digital trunk circuit pack.
The maintenance strategy for the TN2242 is similar to that of the TN464F or later
suffix DS1 interface circuit pack. The TN2242 circuit pack is functionally the same
as the TN464F (without ICSU) with the following exceptions:
The Blue Alarm Inquiry test (#139) always passes for the TN2242.
The test ds1-loop command is not executed for the TN2242.
When reset board is run on a TN2242, a different initialization message is
sent for the local loop-around test (Test #135) is executed.
Since an ICSU (Integrated Channel Service Unit) is not supported on this
circuit pack, tests associated with an ICSU are not executed.
Tests associated with new functionality available with the video-enabled
TN464F are not executed for the TN2242.
CRC (cyclical redundancy check) is not defined for this circuit pack.
The D channel can be user-assigned to any port 1 – 30, when the signaling
mode is ISDN PRI.
Wideband is not supported.
OPSs (off-premises stations) are not supported.
The TN2242 circuit pack also supports specialized versions of CAS (channel-
associated signaling) and ISDN-PRI signaling that pertain to the TTC private
networking environment in Japan.
Upgrading to TN2242
Figure 8-51
The upgrade procedure requires removing the JRC (Japan Radio Corporation)
external converter.
8-1212 Issue 1 May 2002
shows the hardware connections for public network access in Japan.
555-233-142