Instruction manual

Page 1262 of 3156 Digital Trunk Interface – Commonwealth of Independent States
553-3001-306 Standard 10.00 January 2002
To satisfy the unique requirements of CIS DTI signaling, two new trunk cards
have been introduced: a dual 2 Mbps Enhanced Network (ENET) styled
digital trunk card (CDTI2); and a 2 Mbps digital trunk card (CSDTI2) for use
with Option 11C systems. The CDTI2 card provides 60 voice or data 64 kbps
channels, whereas the CSDTI2 card provides 30 voice or data 64 kbps
channels. Each card occupies one card slot on the common equipment shelf
(CDTI2), or on the Option 11C base cabinet (CSDTI2)
In addition to most of the features provided by digital trunks, the CDTI2 and
CSDTI2 cards provide the following features intended for the CIS market:
• CIS digital trunk signaling (outgoing, incoming toll, and incoming local
calls)
• Automatic Number Identification (ANI) transmission for outgoing calls
on request from the Public Exchange
• Special disconnect procedure (two-way release) on incoming local
answered calls initiated by the Public Exchange to provide Malicious
Call Trace
• Unanswered free special service calls – outgoing calls that remain
unanswered are recognized in a special manner to allow the called party
(special service operator) to disconnect the calls
• CIS transmission plan
• Downloading the required firmware mode per loop, and
• Dial tone provided internally to the calling party by the Meridian 1 after
seizure of an outgoing CIS trunk. However, for outgoing call terminating
to a busy, vacant, invalid, or restricted DN, the Meridian 1 does not
provide busy/overflow tone. The Public Exchange will send the tone on
the speech path.
The CIS DTI trunk provides significant improvement on real-time impact for
dial pulse outpulsing and digit collection by transferring these processes from
the software to the firmware. The trunk state change validation timing is
performed by the firmware. A Firmware Unproductive Timer is used to
prevent a call on a CIS trunk from remaining unanswered for too long.