Technical information

Technician’s Handbook

E1/T1 (DS1) Formatter Card Switch Settings

Set E1/T1 mode using the E1/T1 switches on the card’s side

PRI Cards and DS1/CEPT I and II Cards

To set the card for LT, remove the NT jumper blocks and

place them on the LT jumpers.

Figure 10: Dual E1 PRI Card

Table 10: E1/T1 (DS1) Formatter Card Switch Settings

E1/T1 Switches

Mode Channel

Switch 1

(Link 1)

Switch 2

(Link 2)

E1 mode (compatible for connection

to MSDN DS1 trunks that have been

externally converted from MSDN

CEPT trunks)

data not

inverted

open open

T1 mode (normal DS1 formatter card

operation)

data

inverted

closed closed

Note: If you set a link for E1 mode, the data on channel 24 is not inverted. The

external carrier must map the channels to the CEPT link.