12DS3/EC1 (LNW16) and 48DS3/EC1 (LNW19B)

DS3 electrical specification

The low-speed DS3 interfaces transmit/receive a standard electrical DS3 signal as specified in GR-499-CORE, Section 9 (44.736 Mb/s rate, DSX-3 interconnect specification, bipolar 3-zero substitution (B3ZS) encoding). However, the signal does not have to contain a standard DS3 frame.

LNW111

When LNW141 or LNW84 VLF Main packs are installed, the LNW111 circuit packs are not supported. However, non-VLF Mains do support the LNW111.

EC-1 electrical specification

The EC-1 low-speed interfaces provide transport of any STS-1 signal compatible with the electrical STS-1 interface specification in GR-253-CORE, Issue 3. The EC-1 low-speed port can be provisioned to provide STS-1 path termination functions for a VT1.5 structured STS-1 with an asynchronous DS1 mapping.

The low-speed EC-1 interfaces transmit/receive a standard electrical EC-1 signal as specified in GR-253-CORE, Issue 3 (51.844 Mb/s rate, STSX-1 interconnect specification, bipolar 3-zero substitution (B3ZS) encoded and scrambled).

DS3/EC-1 port provisioning

The LNW16 and LNW19B circuit packs support DS3 or EC-1 service on a per-port basis. Therefore, a single circuit pack can support a variety of DS3 and/or EC-1 traffic.

DS3/EC-1 transmission length

Line build-outs are software-provisionable. The maximum distance depends on the cable type.

Table 10-2: DS3/EC-1 cable lengths

Cable type	LBO in	LBO out
728A/B	0–255 ft.	255–450 ft.
735A	0–112 ft.	112–225 ft.