NEC NEAX2400 ICS, Руководство по программированию

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NEAX2400 IPX Feature Programming Manual
Page 1024
NDA-24297, Issue 1
S-60 Synchronous Data Switching - CCIS
Interactions (cont’d)
4. For greater detail, refer to ETI: 010, D
term
IV, V Asynchronous Data Adapter - Installation and
Programming.
5. Switched Synchronous Communication Using The DT-003 Data Module:
Typically, switched (dialed) synchronous connections are attached to computers using Half Duplex
protocols. In most cases where a Half Duplex protocol is used, the DM has to be set for Full Duplex (via
SW0) because the NEAX2400 IPX provides a Full Duplex link. This will normally not affect the Half
Duplex protocol handshaking.
Internal:
Internal switched synchronous connections can be provided up to 56 Kbps.
T1:
a.) Over T1, a switched synchronous speed of up to 48 Kbps can be provided using the 8DST (PA-
8DSTB) circuit card.
b.) With T1 synchronous communication between two NEAX2400's, one of the sites must be a
Primary or Sub Primary (PLO-A); otherwise, slips will occur, increasing the Bit Error Rate.
c.) At the NEAX2400 IPX secondary site, T1 (24DTI) cards are connected via a PLO card to derive
Primary Clock from the network in priority order. If priority is set up incorrectly, or if two
primary clocks are coming in, slips may occur which will not cause a T1 error, but will cause
improper data synchronization. Also, Zero Suppression (ZCS) using the 24DTI switch setting
must be turned ON (SW1-3UP).
CCIS:
a.) With CCIS, switched speeds up to 56 Kbps can be provided when bit stealing is not used by the
24 DTI and associated T1 facilities.
b.) In order to have switched synchronous data at 56 Kbps with CCIS, a 24DTI (PA-24DTA-B or
higher) circuit card is required. Switched synchronous data at 56 Kbps is not presently provided
on the 8DST circuit card.
Nailed Down Connection:
Internal:
a.) When the nailed down connection is within the NEAX2400 IPX, use the AFCD command to set
EAD Data as follows:
•
EAD-A: Originating Station - 00-DT-003 or DA-007
• EAD-B: Terminating Station - 00-DT-003 or DA-007
Internal Nailed Down connections can be provided up to 56 Kbps Note 2 .
T1:
a.) When the connection is over a T1 channel, use the AFCD command to set EAD Data as follows:
• EAD-A: Originating Station: 00
• EAD-B: Terminating Station (T1 channel): 05
The above must also be programmed at the second site.
Note 1:
The AFCD command will not work unless SYS Data 1, Index 60, Bit 4 is set to 1 (Fixed Connection in
service).
Note 2:
Nailed Down connections up to 56 Kbps over T1 channels can be used, as long as the PAD selected in the
AFCD command for the T1 channel is 5.
Switched Connection Via The 24 DIT:
a.) The routes used for communication with the DT-003 Data Module via the 24DTI are
programmed in ARTD:
•
CDN 45:A/D = 1 (Digital Line Data)
• CDN 30:PAD = 5 (for Bit Stealing - reverses order of DO and S bits)