The NTBK51 daughterboard provides two Multipurpose Serial Data Link (MSDL) based Downloadable D-channel (DCH) interfaces.
NTBK50 2Mb PRI, with
When the Dual D-Channel daughter Board is used with a NT5D97 Dual-port DTI2/PRI2 card (large system), the PRI cards DIP switches must set the MSDL device address. When used with a NTBK50 2.0 Mb PRI card (small system), only Port 1 is used. Refer to the Circuit Card Reference NTP for details.
After building a DCH in LD 17, the configuration must always be written to the daughter board in LD 96:
ENL MSDL X FDL
LD 17, CHG ADAN:
ADAN DCH x CTYP MSDL Card type is MSDL DNUM xx Use the DNUM that was set by the DIP switches PORT 0 0 for EVEN PRI loop / 1 for ODD PRI loop, or small system DES E1_DID Designator USR PRI DCHL XX Associated PRI Loop number OTBF 32 PARM RS422 DTE DRAT 64KC CLOK EXT IFC D100 SIDE USR CNEG 1 RLS ID 25 RCAP MBGA NO OVLR NO OVLS NO T200 3 T203 10 N200 3 N201 260 K 7
Useful LD 96 MSDL/DCH maintenance commands. x is the MSDL device number (DNUM in LD 17), or DCH number.
When you first enable a new MSDL/DCH (or after a change) always 'Force Download' (FDL) the configuration, and watch for the dots.
ENL MSDL x (FDL, ALL) Enable MSDL device (FDL: Force DownLoad new or changed configuration) DIS MSDL x (ALL) Disable MSDL device RST MSDL x Reset MSDL device STAT MSDL (x) (FULL) Get MSDL status SLFT MSDL x Execute a self-test on MSDL device x ENL DCH x (FDL) Enable DCH x and attempt to establish the link, and force download to MSDL DIS DCH x Disable DCH x RST DCH x Reset D-channel x, inhibit signaling STAT DCH (x) Get status of one or all D-channels MAP DCH Show the D-channel hardware port assignments ENL AUTO x Enable automatic recovery for DCH x DIS AUTO x Disable automatic recovery for DCH x
D Channel status:
D Channel status is displayed in LD 96 with
STAT DCH x.
If x is omitted, the status of all D channels is output. The output format is:
DCH x : <Application_status> <Link_status> AUTO XX DES
APRI- Awaiting PRI response
CPRI- Checking PRI
DIAG- application has failed
DSBL- application is disabled
OPER- link is operational
RST- application is in reset state
SDCH- Setting D-channel
AEST- Awaiting establishment
ARLS- Awaiting release
EST ACTV- DCH link is established and active
EST STBY- DCH link is established and is the standby
FAIL- DCH link has failed
REST- request establishment
RLS- DCH link is released
RST- DCH link is in reset state
TST- Test mode
AUTO- if auto-recovery is enabled, AUTO is shown
XX- BKUP x / PRIM x (associated primary or backup DCH, only if applicable)
DES :- the DCH circuit designator follows
>ld 96 DCH000 .stat dch DCH 05 : DSBL RST AUTO DES : E1_DID <- this is down! DCH 06 : OPER EST ACTV AUTO DES : E1_TIE <- this is good!
PRI cards have faceplate status LEDs, the dual-color DCHI LED indicates the NTBK51 daughter board status:
Status Definition NTBK51 is equipped, but disabled. NTBK51 is enabled, but not necessarily established. NTBK51 is not equipped.