Nortel DMS-250 - Optimal DS-1;D-Channel Handler Card Assignments on DMS-250 DTCI; Signaling Terminals; DTCI Port Allocation

11-2 Engineering recommendations
297-2521-106 Standard 23.01 March 2001
Optimal DS-1/D-channel handler card assignments on DMS-250 DTCI
This does not apply; this manual pertains to signaling terminal (ST) card
provisioning.
Signaling terminals
This does not apply to the DTCI.
DTCI port allocation
DS-1/DS-30 port groups
For trunk call processing, C-side channels are preallocated for each trunk
member. The members on the first five P-side ports (0 to 4) are scattered
over the channels on the first four C-side ports (0 to 3). The next five P-side
ports use the next four C-side ports, and so on. The scattering of channels
was chosen to minimizes transit delays through the DTCI timeswitch.
Scattering also reduces the chances of an entire DS-1 being taken out of
service by a C-side link failure. (C-side ports can only be datafilled in
ascending order in table LTCINV.)
Table 11-1 summarizes the mapping of groups of P-side ports to C-side
ports. The number of ports usable as DS-1 ports and ST ports per grouping
is also indicated.
Table 11-1
PRI DTCI P-side-to-C-side port mapping
Port group
(configuration)
P-side port C-side port
DS-1 ports
minimum
DS-1 ports
maximum
A 0–4 0–3 3 4
B 5–9 4–7 3 5
C 10–14 8–11 5 5
D 15–19 12–15 5 5
—end—
C-side port requirements
C-side port requirements do not apply because ST cards are not used on the
DTCI.
DS-1 card locations
DS-1 card locations do not apply because ST cards are not used on the
DTCI.