[root@freepbx ~]# vi /etc/asterisk/dahdi-channels.conf

; Span 1: TE4/0/1 "T4XXP (PCI) Card 0 Span 1" ESF/B8ZS ClockSource
group=0,11
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 1-23
context = default
group = 63

; Span 2: TE4/0/2 "T4XXP (PCI) Card 0 Span 2" (MASTER) ESF/B8ZS
group=0,12
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 25-47
context = default
group = 63

; Span 3: TE4/0/3 "T4XXP (PCI) Card 0 Span 3" ESF/B8ZS
group=0,13
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 49-71
context = default
group = 63

; Span 4: TE4/0/4 "T4XXP (PCI) Card 0 Span 4" ESF/B8ZS
group=0,14
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 73-95
context = default
"/etc/asterisk/dahdi-channels.conf" 45L, 1110C

[root@issabel ~]# dahdi_test
Opened pseudo dahdi interface, measuring accuracy...
99.999% 99.996% 99.998% 99.999% 99.999% 99.999% 99.999% 100.000%
99.997% 99.997% 99.999% 99.999% 99.999% 99.999% 99.999% 99.999%
99.998% 99.999% 99.997% 99.999% 99.999% 99.999% 99.999% 100.000%

[root@issabel ~]# lspci

03:04.0 Communication controller: Digium, Inc. Wildcard TE405P/TE407P quad-span T1/E1/J1 card 5.0V (rev 02)